1,4-二甲基哌嗪

dimethyl-3,8 diaza-3,8 bicyclo<4.3.0>nonane

1-甲基-1,4,5,6-四氢-2-吡啶甲腈

1-甲基-4-苯基-哌啶

N-(1-methylpiperidin-2-ylidene)methanesulfonamide