Pyrazines

Recommanded Product: Pyrazine-2-carboxylic acid. Hassan, NW; Saudi, MN; Abdel-Ghany, YS; Ismail, A; Elzahhar, PA; Sriram, D; Nassra, R; Abdel-Aziz, MM; El-Hawash, SA in [Hassan, Nayera W.; Saudi, Manal N.; Abdel-Ghany, Yasser S.; Ismail, Azza; Elzahhar, Perihan A.; El-Hawash, Soad A.] Alexandria Univ, Fac Pharm, Dept Pharmaceut Chem, Alexandria 21521, Egypt; [Sriram, Dharmarajan] Birla Inst Technol & Sci Pilani, Med Chem & Drug Discovery Res Lab, Pharm Grp, Hyderabad Campus, Jawahar Nagar 500078, Telangana, India; [Nassra, Rasha] Alexandria Univ, Fac Med, Dept Med Biochem, Alexandria, Egypt; [Abdel-Aziz, Marwa M.] Al Azhar Univ, Reg Ctr Mycol & Biotechnol, Cairo 11759, Egypt published Novel pyrazine based anti-tubercular agents: Design, synthesis, biological evaluation and in silico studies in 2020, Cited 84. The Name is Pyrazine-2-carboxylic acid. Through research, I have a further understanding and discovery of 98-97-5.

TB continues to be a leading health threat despite the availability of powerful anti-TB drugs. We report herein the design and synthesis of various hybrid molecules comprising pyrazine scaffold and various formerly identified anti-mycobacterial moieties. Thirty-one compounds were screened in vitro for their activity against Mycobacterium tuberculosis H37Rv strain using MABA assay. The results revealed that six compounds (8a, 8b, 8c, 8d, 14b and 18) displayed significant activity against Mtb with MIC values <= 6.25 mu g/ml versus 6.25 mu g/ml for pyrazinamide. The most active compounds were then assessed for their in vitro cytotoxicity against PBMC normal cell line using MTT assay and showed SI > 200. Several in silico studies have been carried out for target fishing of the novel compounds such as shape-based similarity, pharmacophore mapping and inverse docking. Based on this multi-step target fishing study, we suggest that pantothenate synthetase could be the possible target responsible for the action of these compounds. The most active compounds were then successfully docked into the active site of pantothenate synthetase enzyme with favorable binding interactions. In addition, in silico prediction of physicochemical, ADMET and drug-like properties were also determined indicating that compounds 8b, 8c and 8d are promising candidates for the development of new anti-TB agents with enhanced activity and better safety profile.

Welcome to talk about 98-97-5, If you have any questions, you can contact Hassan, NW; Saudi, MN; Abdel-Ghany, YS; Ismail, A; Elzahhar, PA; Sriram, D; Nassra, R; Abdel-Aziz, MM; El-Hawash, SA or send Email.. Recommanded Product: Pyrazine-2-carboxylic acid

Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Authors Khavasi, HR; Gholami, A; Hosseini, M; Nikpoor, L; Eskandari, K in AMER CHEMICAL SOC published article about HALIDE ION SYNTHON; CRYSTAL-STRUCTURES; INTERMOLECULAR INTERACTIONS; HYDROGEN-BONDS; MOLECULES; HIERARCHY; CROSSOVER; LIGANDS; METALS; BR in [Khavasi, Hamid Reza; Gholami, Akram; Hosseini, Mahdieh; Nikpoor, Leyla] Shahid Beheshti Univ, Dept Inorgan Chem & Catalysis, Tehran 1983963113, Iran; [Eskandari, Kiamars] Isfahan Univ Technol, Dept Chem, Esfahan 8415683111, Iran in 2020, Cited 45. Product Details of 98-97-5. The Name is Pyrazine-2-carboxylic acid. Through research, I have a further understanding and discovery of 98-97-5

A family of 10 compounds, each containing a MX2-pyrazine carboxylate complex anion and a protonated halo- (X’-) amino pyridine cation (MX2 = ZnCl2, ZnBr2, ZnI2, HgBr2, and HgI2; X’ = Cl, Br, I), are presented; a suitable system for pursuing C-X’center dot center dot center dot X-M halogen bonding (XB). The influence of halogen manipulation, metal ion and coordination variation on the nature and strength of C-X’center dot center dot center dot X-M interactions was discussed in terms of geometrical parameters, binding energies and charge density analysis with emphasis on the Laplacian of the electron density, del(2)rho. Interplay of XBs with other noncovalent interactions, mainly N-H center dot center dot center dot XM and N-py-H+center dot center dot center dot O- bonds, in supramolecular assemblies, were also investigated. The C-X’center dot center dot center dot X-M and N-H center dot center dot center dot X-M bonds have rationally been modified in strength upon changing the halogens involved, leading to systematic variations in the crystal packing.

Product Details of 98-97-5. Bye, fridends, I hope you can learn more about C5H4N2O2, If you have any questions, you can browse other blog as well. See you lster.

Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

In 2020 CRYST GROWTH DES published article about HALIDE ION SYNTHON; CRYSTAL-STRUCTURES; INTERMOLECULAR INTERACTIONS; HYDROGEN-BONDS; MOLECULES; HIERARCHY; CROSSOVER; LIGANDS; METALS; BR in [Khavasi, Hamid Reza; Gholami, Akram; Hosseini, Mahdieh; Nikpoor, Leyla] Shahid Beheshti Univ, Dept Inorgan Chem & Catalysis, Tehran 1983963113, Iran; [Eskandari, Kiamars] Isfahan Univ Technol, Dept Chem, Esfahan 8415683111, Iran in 2020, Cited 45. The Name is Pyrazine-2-carboxylic acid. Through research, I have a further understanding and discovery of 98-97-5. Recommanded Product: Pyrazine-2-carboxylic acid

A family of 10 compounds, each containing a MX2-pyrazine carboxylate complex anion and a protonated halo- (X’-) amino pyridine cation (MX2 = ZnCl2, ZnBr2, ZnI2, HgBr2, and HgI2; X’ = Cl, Br, I), are presented; a suitable system for pursuing C-X’center dot center dot center dot X-M halogen bonding (XB). The influence of halogen manipulation, metal ion and coordination variation on the nature and strength of C-X’center dot center dot center dot X-M interactions was discussed in terms of geometrical parameters, binding energies and charge density analysis with emphasis on the Laplacian of the electron density, del(2)rho. Interplay of XBs with other noncovalent interactions, mainly N-H center dot center dot center dot XM and N-py-H+center dot center dot center dot O- bonds, in supramolecular assemblies, were also investigated. The C-X’center dot center dot center dot X-M and N-H center dot center dot center dot X-M bonds have rationally been modified in strength upon changing the halogens involved, leading to systematic variations in the crystal packing.

Recommanded Product: Pyrazine-2-carboxylic acid. Bye, fridends, I hope you can learn more about C5H4N2O2, If you have any questions, you can browse other blog as well. See you lster.

Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Application In Synthesis of Pyrazine-2-carboxylic acid. Stonelake, TM; Phillips, KA; Otaif, HY; Edwardson, ZC; Horton, PN; Coles, SJ; Beames, JM; Pope, SJA in [Stonelake, Thomas M.; Phillips, Kaitlin A.; Otaif, Haleema Y.; Edwardson, Zachary C.; Beames, Joseph M.; Pope, Simon J. A.] Cardiff Univ, Sch Chem, Cardiff CF10 3AT, Wales; [Horton, Peter N.; Coles, Simon J.] Univ Southampton, Fac Nat & Environm Sci, UK Natl Crystallog Serv, Chem, Southampton SO17 1BJ, Hants, England published Spectroscopic and Theoretical Investigation of Color Tuning in Deep-Red Luminescent Iridium(III) Complexes in 2020, Cited 60. The Name is Pyrazine-2-carboxylic acid. Through research, I have a further understanding and discovery of 98-97-5.

A series of heteroleptic, neutral iridium(III) complexes of the form [Ir(L)(2)(N boolean AND O)] (where L = cyclometalated 2,3-disubstituted quinoxaline and N boolean AND O = ancillary picolinate or pyrazinoate) are described in terms of their synthesis and spectroscopic properties, with supporting computational analyses providing additional insight into the electronic. properties. The 10 [Ir(L)(2)(N boolean AND O)] complexes were characterized using a range of analytical techniques (including H-1, C-13, and F-19 NMR and IR spectroscopies and mass spectrometry). One of the examples was structurally characterized using X-ray diffraction. The redox properties were determined using cyclic voltammetry, and the electronic properties were investigated using UV-vis, time-resolved luminescence, and transient absorption spectroscopies. The complexes are phosphorescent in the red region of the visible spectrum (lambda(em) = 633-680 nm), with lifetimes typically of hundreds of nanoseconds and quantum yields ca. 5% in aerated chloroform. A combination of spectroscopic and computational analyses suggests that the long-wavelength absorption and emission properties of these complexes are strongly characterized by a combination of spin-forbidden metal-to-ligand charge-transfer and quinoxaline-centered transitions. The emission wavelength in these complexes can thus be controlled in two ways: first, substitution of the cyclometalating quinoxaline ligand can perturb both the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital levels (LUMO, Cl atoms on the ligand induce the largest bathochromic shift), and second, the choice of the ancillary ligand can influence the HOMO energy (pyrazinoate stabilizes the HOMO, inducing hypsochromic shifts).

Welcome to talk about 98-97-5, If you have any questions, you can contact Stonelake, TM; Phillips, KA; Otaif, HY; Edwardson, ZC; Horton, PN; Coles, SJ; Beames, JM; Pope, SJA or send Email.. Application In Synthesis of Pyrazine-2-carboxylic acid

Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

An article Mechanochemical synthesis, characterization and thermal study of new cocrystals of ciprofloxacin with pyrazinoic acid and p-aminobenzoic acid WOS:000494796900008 published article about PHARMACEUTICAL COCRYSTALS; SALTS; DESIGN; POLYMORPHISM; INVESTIGATE; SOLUBILITY; STABILITY; BEHAVIOR; COFORMER; LIQUID in [de Almeida, Amanda Cosmo; Ferreira, Patricia Osorio; Ekawa, Bruno; Sobral Carvalho, Ana Carina; Caires, Flavio Junior] Sao Paulo State Univ, Inst Chem, UNESP, Araraquara, Brazil; [Torquetti, Carolina; dos Santos, Everton Carvalho; Caires, Flavio Junior] Sao Paulo State Univ, Sch Sci, UNESP, Bauru, Brazil in 2020, Cited 52. Safety of Pyrazine-2-carboxylic acid. The Name is Pyrazine-2-carboxylic acid. Through research, I have a further understanding and discovery of 98-97-5

Novel cocrystals of ciprofloxacin with pyrazinoic acid and p-aminobenzoic acid in the 1:1 stoichiometric ratio were obtained by the mechanochemical method, under conditions of liquid-assisted grinding (LAG/ethanol) and neat grinding. They were characterized by powder X-ray diffractometry, infrared spectroscopy, simultaneous thermogravimetry, differential thermal analysis, differential scanning calorimetry (DSC) and DSC-Microscopy system. The results confirmed the successful synthesis of the cocrystals and indicated the functional groups responsible for the formation of the new supramolecular synthons. In addition, from the thermal analysis, it was possible to evaluate the thermal stability, composition, crystallization processes during heating, polymorphic transitions and construct the binary phase diagrams.

Welcome to talk about 98-97-5, If you have any questions, you can contact de Almeida, AC; Ferreira, PO; Torquetti, C; Ekawa, B; Carvalho, ACS; dos Santos, EC; Caires, F or send Email.. Safety of Pyrazine-2-carboxylic acid

Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Recently I am researching about NONCOVALENT; APOPTOSIS; PATHWAY; POTENT, Saw an article supported by the National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [81872731, 21977006, 21807006]. Published in ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER in ISSY-LES-MOULINEAUX ,Authors: Sun, Q; Zhou, TL; Xi, DD; Li, XN; Lu, ZR; Xu, FR; Wang, C; Niu, Y; Xu, P. The CAS is 98-97-5. Through research, I have a further understanding and discovery of Pyrazine-2-carboxylic acid. SDS of cas: 98-97-5

A series of tripeptidic proteasome inhibitors with furylketone as C-terminus were designed and synthesized. Biochemical evaluations against beta 1, beta 2 and beta 5 subunits revealed that they acted selectively on beta 5 subunit with IC(50)s against chymotrypsin-like (CT-L) activity in micromolar range. LC-MS/MS analysis of the ligand-20S proteasome mixture showed that the most potent compound 11m (IC50 = 0.18 mu M) made no covalent modification on 20S proteasome. However, it was identified acting in a slowly reversible manner in wash-out assay and the reversibility was much lower than that of MG132, suggesting the possibility of these tripeptidic furylketones forming reversible covalent bonds with 20S proteasome. Several compounds were selected for anti-proliferative assay towards multiple cancer cell lines, and compound 11m displayed comparable potency to positive control (MG132) in all cell lines tested. Furthermore, the pharmacokinetic (PK) data in rats indicated 11m behaved similarly (C-max, 2007 mu g/L; AUC(0-t), 680 mu g/L.h; V-ss, 0.66 L/kg) to the clinical used agent carfilzomib. All these data suggest 11m is a good lead compound to be developed to novel anti-tumor agent. (c) 2020 Elsevier Masson SAS. All rights reserved.

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Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Authors Das, R; Mehta, DK in GEORG THIEME VERLAG KG published article about MYCOBACTERIUM-TUBERCULOSIS; ANTIINFLAMMATORY ACTIVITY; LUMAZINE SYNTHASE; BINDING MODE; BETA-LACTAMS; 1,3,4-OXADIAZOLE; AZETIDINONES; RESISTANCE; INHIBITORS; DESIGN in [Das, Rina; Mehta, Dinesh Kumar] Maharishi Markandeshwar Deemed Be Univ, MM Coll Pharm, Ambala 133207, Haryana, India in 2021, Cited 50. SDS of cas: 98-97-5. The Name is Pyrazine-2-carboxylic acid. Through research, I have a further understanding and discovery of 98-97-5

Background Tuberculosis (TB) caused by Mycobacterium tuberculosis is one of the main killers of people all over the world. The major hurdles with existing therapy are the lengthy regimen and appearance of multi drug resistant (MDR) and extensively drug resistant (XDR) strains of M.tuberculosis. Aims The present work was aimed to synthesize and determine antitubercular and antimicrobial potential of some novel 3-chloro-4-aryl-1-[4-(5-pyrazin-2-yl[1,3,4]oxadiazole-2-ylmethoxy)-phenyl]-azetidin-2-one derivatives 7(a-h) from pyrazinoic acid as precursor, which is a well-established antitubercular agent. Here we report the synthesis of a new class of heterocyclic molecules in which pyrazine, 1, 3, 4-oxadiazole and azetidinone moieties were present in one frame work. Methods Pyrazinoic acid (1) was esterified first (2) followed by amination to produce hydrazide (3) which was refluxed with POCl3 to obtain 2-chloromethyl-5pyrazino-1, 3, 4-oxadiazole (4). This was then further reacted with 4-amino phenol to obtain 4-[5-pyrazino-1, 3, 4-oxadiazol-2-yl-methoxy]-phenyl amine (5) which on condensation with various aromatic aldehydes afforded a series Schiff’s bases 6(a-h). Dehydrative annulations of 6(a-h) in the presence of chloroacetyl chloride and triethylamine yielded 3-chloro-4-aryl-1-[4-(5-pyrazin-2-yl-[1, 3, 4]oxadiazole-2-ylmethoxy)-phenyl]-azetidin-2-one derivatives 7(a-h). Antibacterial, antifungal and antitubercular potential of all the synthesized compounds were assessed. Docking study was performed using the software VLife Engine tools of Vlifemds 4.6 on the protein lumazine synthase of M. tuberculosis (PDB entry code 2C92). Results The present studies demonstrated that synthesized oxadiazole derivatives have good antimicrobial activity against the various microorganisms. Among the synthesized derivative, 7b and 7g were found to be prominent compounds which have potential antibacterial, antifungal and antitubercular activity (with MIC 3.12 mu g/ml and high dock score ranging from -59.0 to -54.0) against Mycobacterium tuberculosis. Conclusions Derivatives 7b and 7g would be effective lead candidates for tuberculosis therapy.

SDS of cas: 98-97-5. Welcome to talk about 98-97-5, If you have any questions, you can contact Das, R; Mehta, DK or send Email.

Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Cox, B; Duffy, J; Zdorichenko, V; Bellanger, C; Hurcum, J; Laleu, B; Booker-Milburn, KI; Elliott, LD; Robertson-Ralph, M; Swain, CJ; Bishop, SJ; Hallyburton, I; Anderson, M in [Duffy, James; Laleu, Benoit] Med Malaria Venture, CH-1215 Geneva 15, Switzerland; [Cox, Brian; Zdorichenko, Victor; Bellanger, Corentin; Bishop, Stephen J.] Univ Sussex, Photodivers Ltd, Sch Life Sci, Brighton BN1 9QJ, E Sussex, England; [Hurcum, Jessica] Univ Sussex, Sch Life Sci, Brighton BN1 9QJ, E Sussex, England; [Booker-Milburn, Kevin, I; Elliott, Luke D.] Univ Bristol, Sch Chem, Bristol BS8 1TS, Avon, England; [Booker-Milburn, Kevin, I; Robertson-Ralph, Michael] Univ Bristol, Sch Chem, Photodivers Ltd, Bristol BS8 1TS, Avon, England; [Swain, Christopher J.] Cambridge MedChem Consulting, Cambridge CB22 4RN, England; [Hallyburton, Irene; Anderson, Mark] Univ Dundee, Wellcome Ctr Antiinfect Res, Drug Discovery Unit, Dundee DD1 5EH, Scotland published Escaping from Flatland: Antimalarial Activity of sp(3)-Rich Bridged Pyrrolidine Derivatives in 2020, Cited 18. Formula: C5H4N2O2. The Name is Pyrazine-2-carboxylic acid. Through research, I have a further understanding and discovery of 98-97-5.

We utilized synthetic photochemistry to generate novel sp 3 -rich scaffolds and report the design, synthesis, and biological testing of a diverse series of amides based on the 1-(amino-methyl)-2-benzyl-2-azabicyclo[2.1.1]hexane scaffold. Preliminary antimalarial screening of the library provided promising compounds with activity in the 1-5 mu M range with an enhanced hit rate. Further evaluation (solubility, drug metabolism and pharmacokinetics (DMPK), and toxicity) of a selected compound (9) suggested that this series represents an excellent opportunity for further optimization with the framework offering multiple opportunities for the addition of uniquely vectorally positioned extra functionality.

Formula: C5H4N2O2. Bye, fridends, I hope you can learn more about C5H4N2O2, If you have any questions, you can browse other blog as well. See you lster.

Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

COA of Formula: C5H4N2O2. Authors Dumpala, RMR; Das, SK; Ali, M; Boda, A; Kumar, P; Rawat, N; Kumar, A; Ali, SM in PERGAMON-ELSEVIER SCIENCE LTD published article about in [Dumpala, Rama Mohana Rao; Rawat, Neetika] Bhabha Atom Res Ctr, Radiochem Div, Mumbai 400094, Maharashtra, India; [Das, Sourav Kumar; Ali, Manjoor; Kumar, Amit] Bhabha Atom Res Ctr, Radiat Biol & Hlth Sci Div, Mumbai 400094, Maharashtra, India; [Boda, Anil; Ali, Sk Musharaf] Bhabha Atom Res Ctr, Chem Engn Div, Mumbai 400094, Maharashtra, India; [Kumar, Pranaw] Bhabha Atom Res Ctr, Fuel Chem Div, Mumbai 400094, Maharashtra, India in 2021, Cited 78. The Name is Pyrazine-2-carboxylic acid. Through research, I have a further understanding and discovery of 98-97-5

Thorium (Th) exposure to the human beings is a radiochemical hazard and the chelation therapy by suitable drugs is the major prevention approach to deal with. The present studies aimed at usage of pyrazinoic acid (PCA), which is a prodrug to treat tuberculosis, for its usage as decorporating agent for thorium from human body. The present studies provide a comprehensive knowledge on the chemical interaction and biological efficacy of pyrazinoic acid (PCA) for decorporation of Thorium from the human body. The thermodynamic parameters for Th-PCA speciation are determined by both experiment and theory. The potentiometric data analysis and Electro-Spray Ionization Mass Spectrometry (ESI-MS) studies revealed the formation of MLi (i = 1-4) species with the decrease in stepwise stability constants. All the species formations are endothermic reactions and are predominantly entropy-driven. Biological experiments using human erythrocytes, whole blood and normal human lung cells showed cytocompatibility and decorporation ability of PCA for Thorium. Density functional calculations have been carried out to get insights on interaction process at molecular level. The experimental results and theoretical predictions found to be in line with each other. Present findings on complexation of Th by PCA and its evaluation in human cells and blood would further motivate determination of its safety levels and decorporation efficacy in animal models. (C) 2021 Elsevier Ltd. All rights reserved.

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Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

An article Design, synthesis and anti-inflammatory evaluation of 3-amide benzoic acid derivatives as novel P2Y(14) receptor antagonists WOS:000493211900018 published article about MECHANISMS; IDENTIFICATION; INFLAMMASOME; CHEMOTAXIS in [Zhang, Zhenguo; Lu, Ran; Jiang, Cheng] China Pharmaceut Univ, Jiang Su Key Lab Drug Design & Optimizat, Tongjiaxiang 24, Nanjing 210009, Jiangsu, Peoples R China; [Zhang, Zhenguo; Lu, Ran; Li, Baiyang; Meng, Zibo; Jiang, Cheng] China Pharmaceut Univ, Dept Med Chem, Tongjiaxiang 24, Nanjing 210009, Jiangsu, Peoples R China; [Hao, Kun] China Pharmaceut Univ, State Key Lab Nat Med, Tongjiaxiang 24, Nanjing 210009, Jiangsu, Peoples R China; [Li, Hanwen; Liu, Chunxiao; Zhou, Mengze; Hu, Qinghua] China Pharmaceut Univ, Key Lab Drug Metab & Pharmacokinet, Tongjiaxiang 24, Nanjing 210009, Jiangsu, Peoples R China in 2019, Cited 35. The Name is Pyrazine-2-carboxylic acid. Through research, I have a further understanding and discovery of 98-97-5. Category: Pyrazines

The P2Y(14) receptor (P2Y(14)R) plays a key role in the modulation of inflammatory process, but very few classes of antagonists have been reported. A series of 3-amide benzoic acid derivatives were identified as novel and potent P2Y(14)R antagonists. The most potent antagonist, 16c, showed comparable activity (IC50 = 1.77 nM) to PPTN, the most potent P2Y(14)R antagonist reported. Compound 16c demonstrated dramatically improved aqueous solubility and excellent metabolic stability in rat and human microsomes. Investigation of the anti-inflammatory effect of 16c was performed in MSU treated THP-1 cells by flow cytometry, Western Blot and immunofluorescence labeling technology, which exhibited that 16c might be a promising candidate for further research. (C) 2019 Elsevier Masson SAS. All rights reserved.

Category: Pyrazines. Bye, fridends, I hope you can learn more about C5H4N2O2, If you have any questions, you can browse other blog as well. See you lster.

Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem