(S)-2-{3-[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)-phenyl]-ureido}-pentanedioic acid diallyl ester