Foks, Henryk published the artcileAminomethylation of pyridine and pyrazine carbothioamides. I. Pyrazine carbothioamide and pyridine 2-ethyl-4-carbothioamide in the Mannich reaction, Computed Properties of 4604-72-2, the publication is Gdansk. Tow. Nauk., Rozpr. Wydz. 3 (1969), 203-9, database is CAplus.
Aminomethylation of pyrazine carbothioamide with HCHO and piperidine gave 70% I. 2-Ethylpyridine 4-carbothioamide, HCHO, and piperidine gave II. Similar Mannich bases were prepared with other secondary amines.
Gdansk. Tow. Nauk., Rozpr. Wydz. 3 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, Computed Properties of 4604-72-2.
Referemce:
https://en.wikipedia.org/wiki/Pyrazine,
Pyrazine | C4H4N2 – PubChem