2-((1S,11bS)-1-ethyl-3-oxo-2,3,5,6,11,11b-hexahydro-1H-indolizino[8,7-b]indol-1-yl)acetic acid

ent-4,18-seco-D-noreburnamonine-18-carboxylic acidethylester

ent-1β-cyanmethyl-1α-ethyl-3-oxo-2,3,5,6,11,11bβ-hexahydroindolo[8,7-b]indole

10c-ethyl-2-oxo-1,4,5,10,10b,10c-hexahydro-cyclopropa[1,2]indolizino[8,7-b]indole-1a-carboxylic acid methyl ester

(4S)-N-[2-(3-indolyl)ethyl]-4-ethyl-4-(2-tert-butyldiphenylsiloxyethyl)-5-oxopentamide