哌嗪-1,4-二羧酸二乙酯

1-[2-(4-Methoxyphenyl)ethyl]piperazine

4-氰基-1-哌嗪羧酸乙酯

4-甲基-1-哌嗪羧酸乙酯

ethyl 4-benzylpiperazine-1-carboxylate