5-[2-[2-[2-[2-[2-[2-[2-[[2-[2-[2-[[2-amino-3-oxo-3-(2-phosphonooxyethylamino)propyl]disulfanyl]-5-[3-[3-[(9-methoxy-5,11-dimethyl-6H-pyrido[4,3-b]carbazol-1-yl)amino]propyl-methylamino]propylcarbamoyloxymethyl]phenyl]ethoxy]acetyl]amino]ethoxy]ethoxy]ethyl-[2-[2-(2-ethoxyethoxy)ethoxy]acetyl]amino]ethoxy]ethoxy]ethoxy]ethylamino]-2-[[4-[(2-amino-4-oxo-3H-pteridin-6-yl)methyl-[[3-(3-carboxypropanoyloxymethoxycarbonyl)-4-[(2-oxo-1,3,2lambda5-dioxaphosphinan-2-yl)oxy]phenyl]methoxycarbonyl]amino]benzoyl]amino]-5-oxopentanoic acid