(11S,11aS)-2-((E)-2-Carbamoyl-vinyl)-11-hydroxy-7,8-dimethoxy-5-oxo-11,11a-dihydro-1H,5H-benzo[e]pyrrolo[1,2-a][1,4]diazepine-10-carboxylic acid 2,2,2-trichloro-ethyl ester

{2-[(S)-4-Eth-(E)-ylidene-2-hydroxymethyl-pyrrolidine-1-carbonyl]-4,5-dimethoxy-phenyl}-carbamic acid allyl ester

(2S)-N-[(2-allyloxycarbonylamino)-4,5-dimethoxybenzoyl]-2-(tert-butyldimethylsilyloxymethyl)-4-oxopyrrolidine

{2-[(S)-2-(tert-Butyl-dimethyl-silanyloxymethyl)-4-eth-(E)-ylidene-pyrrolidine-1-carbonyl]-4,5-dimethoxy-phenyl}-carbamic acid allyl ester

(2S)(4R)-N-[(2-Allyloxycarbonylamino)-4,5-dimethoxybenzoyl]-2-(tert-butyldimethylsilyloxymethyl)-4-hydroxypyrrolidine