NC81163
1H-Pyrimido[4′′′′,5′′′′:3′′′,4′′′]cyclobuta[1′′′,2′′′:4′′,5′′]furo[3′′,2′′:6′,7′][1]benzopyrano[4′,3′:3,4]cyclobuta[1,2-d]pyrimidine-1,3,5,10,12(2H,4H,8aH,11H)-pentone, 12b-[[[8-[[[4-(aminoiminomethyl)phenyl][bis(4-nitrophenoxy)phosphinyl]methyl]amino]-1,8-dioxooctyl]amino]methyl]-4,9-bis(2-deoxy-5-...