ethyl 3a-hydroxy-2-oxo-3H-cyclopenta[l]phenanthrene-1-carboxylate

1-(2-甲基苯基)哌啶

dimethyl 2-acetamido-2-(piperidin-1-ylmethyl)propanedioate

N-Methansulfenylpiperidin

(E)-1,1-dimethoxy-5-piperidino-3-hexene