ethyl 5,8-dihydro-8-ethyl-2-(1-piperazinyl)-5-oxopyrido[2,3-d]pyrimidine-6-carboxylate

2-(4-acetyl-piperazin-1-yl)-8-ethyl-5-oxo-5,8-dihydro-pyrido[2,3-d]pyrimidine-6-carboxylic acid ethyl ester

哌嗪(六水)

2-Methylmercapto-5-oxo-8-ethyl-5,8-dihydro-pyrido(2,3-d)-pyrimidine-6-carboxylic acid

硫酸二乙酯