(1S,3S)-1-Isobutyl-2,3,4,9-tetrahydro-1H-β-carboline-3-carboxylic acid amide

(5aR,12S,14aS)-12-isobutyl-1,2,3,5a,6,11,12,14a-octahydro-5H,14H-pyrrolo[1'',2'':4',5']pyrazino[2',1':6,1]pyrido[3,4-b]indole-5,14-dione

(5aS,12S,14aS)-12-isobutyl-11-isopentyl-1,2,3,5a,6,11,12,14a-octahydro-5H,14H-pyrrolo[1'',2'':4',5']pyrazino[1',2':1,6]pyrido[3,4-b]indole-5,14-dione

(S)-1-isobutyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole

(2'S,3S,5'S)-1,2-dihydro-2'-(2-methylpropyl)-2-oxospiro-<3H-indole-3,3'-pyrrolidine>-5'carboxamide