Greksakova, O. published the artcileAntitubercular agents. VIII. Spectral study of some pyrazinecarboxylic acid derivatives, Product Details of C5H5N3S, the publication is Cesko-Slovenska Farmacie (1967), 16(10), 515-19, database is CAplus.
Physicochem. characteristics of pyrazinecarboxamide (pyrazineamide), 5-methoxy-2-pyrazinecarboxamide, 5-butoxy-2-pyrazinecarboxamide and pyrazinecarboxylic acid thioamide were studied by uv spectroscopy. The differences at various pH are not caused by accepting or delivering the proton. Character of the two electronic oscillations in the mol. of each (energy and polarity and their changes caused by the polarity of the solvent) demonstrates the differences.
Cesko-Slovenska Farmacie published new progress about 4604-72-2. 4604-72-2 belongs to pyrazines, auxiliary class Pyrazine,Amine,Amide, name is Pyrazine-2-carbothioamide, and the molecular formula is C5H5N3S, Product Details of C5H5N3S.
Referemce:
https://en.wikipedia.org/wiki/Pyrazine,
Pyrazine | C4H4N2 – PubChem