1,2,3,4-Tetrahydro-β-carbolin-9-ol

(±)-benzyl 2-oxospiro[indoline-3,3'-pyrrolidine]-1'-carboxylate

1-benzyl 3-ethyl 3-(2-nitrophenyl)pyrrolidine-1,3-dicarboxylate

benzyl 1-benzyl-2-oxospiro[indoline-3,3'-pyrrolidine]-1'-carboxylate

4-羟基哌啶