(S)-2-[4-((11S,11aS)-11-Hydroxy-7,8-dimethoxy-5-oxo-2,3,11,11a-tetrahydro-1H,5H-benzo[e]pyrrolo[1,2-a][1,4]diazepine-10-carbonyloxymethyl)-phenoxycarbonylamino]-pentanedioic acid

(S)-2-[4-((11S,11aS)-11-Hydroxy-7,8-dimethoxy-5-oxo-2,3,11,11a-tetrahydro-1H,5H-benzo[e]pyrrolo[1,2-a][1,4]diazepine-10-carbonyloxymethyl)-phenoxycarbonylamino]-pentanedioic acid diallyl ester

(S)-2-[3-(4-{2-[(S)-2-(tert-Butyl-dimethyl-silanyloxymethyl)-pyrrolidine-1-carbonyl]-4,5-dimethoxy-phenylcarbamoyloxymethyl}-phenyl)-ureido]-pentanedioic acid diallyl ester

(S)-2-(4-{2-[(S)-2-(tert-Butyl-dimethyl-silanyloxymethyl)-pyrrolidine-1-carbonyl]-4,5-dimethoxy-phenylcarbamoyloxymethyl}-phenoxycarbonylamino)-pentanedioic acid diallyl ester

(S)-2-{4-[2-((S)-2-Hydroxymethyl-pyrrolidine-1-carbonyl)-4,5-dimethoxy-phenylcarbamoyloxymethyl]-phenoxycarbonylamino}-pentanedioic acid diallyl ester