Rada, B. published the artcileInhibition of virus multiplication by some derivatives of pyridine- and pyrazinecarboxylic acid, Recommanded Product: Pyrazine-2-carbothioamide, the publication is Acta Virologica (English Edition) (1971), 15(4), 326-8, database is CAplus and MEDLINE.
In agar-diffusion plaque-inhibition test with 25 derivatives of pyridine- and pyrazinemono-carboxylic acid, 2-bromo-4-thiocarbamoylpyridine (I) was found effective against vaccinia virus, forming an inhibition zone of medium size without any toxic effect, while 2,6-diethoxy-4-hydroxycarbamoylpyridine and 2-butoxy-4-hydroxycarbamoylpyridine formed large zones of inhibition against vaccinia and western equine encephalomyelitis viruses together with smaller toxic zones.
Acta Virologica (English Edition) 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, Recommanded Product: Pyrazine-2-carbothioamide.
Referemce:
https://en.wikipedia.org/wiki/Pyrazine,
Pyrazine | C4H4N2 – PubChem