2-氨基-5-乙氧羰基-4-羟基嘧啶

2-amino-4-methoxy-5-methoxycarbonilpyrimidine

ethyl 2-acetamido-4-hydroxypyrimidine-5-carboxylate

2-acetylamino-4-chloro-5-ethoxycarbonylpyrimidine

1-乙基-4-氨基哌啶