1,2,3,6-四氢吡嗪-1,2-二羧酸二乙酯

diethyl 4-oxodiazinane-1,2-dicarboxylate

ethyl N-[2-cyclohexyl-1-[ethoxycarbonyl-(ethoxycarbonylamino)amino]-2-morpholin-4-ylethenyl]-N-(ethoxycarbonylamino)carbamate

ethyl N-(ethoxycarbonylamino)-N-(trinitromethyl)carbamate