77168-76-4
3-carbamoyl-1,6-dihydro-6-oxo-2-pyrazinecarboxylic acid
→
~59%
13924-96-4
5-羟基-吡嗪-2-羧酸酰胺
57005-60-4
6-OXO-1,6-DIHYDROPYRAZINE-2,3-DICARBONITRILE