1-(4-ethynyl-4-hydroxypiperidin-1-yl)ethanone

1-[4-(2-bromoanilino)piperidin-1-yl]ethanone

spiro[3,4-dihydrochromene-2,4'-piperidine]-4-ol

4,4-二(4-甲氧基苯基)哌啶

1-(4-二甲基氨基-1-哌啶基)乙酮