5-[2-[2-[2-[2-[2-[2-[2-[2-[[2-[[3-[[5-(2-amino-4-oxo-3,5-dihydropyrrolo[3,2-d]pyrimidin-7-yl)-3,4-dihydroxypyrrolidin-2-yl]methoxy]-7-(carboxymethyldisulfanyl)-3-oxo-1,5-dihydro-2,4,3lambda5-benzodioxaphosphepin-8-yl]disulfanyl]acetyl]amino]ethoxy]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-[2-(dimethylamino)-2-oxoethoxy]carbonyl-4-[(2-oxo-5-phosphonooxy-1,3,2lambda5-dioxaphosphinan-2-yl)oxy]phenyl]methoxycarbonyl]amino]benzoyl]amino]-5-oxopentanoic acid