3,4-二甲基哌嗪-1-羧酸叔丁酯

3-甲基-2-氧代-哌嗪

4-benzyl-3-methyl-piperazine-1-carboxylic acid ethyl ester

N-1-苄基-2-甲基哌嗪

1-benzyl-2-methylpiperazin-3-one