[4S-(4a,4aa,5aa,6b,12aa)]-N-[[4-[[(Aminoiminomethyl)amino]iminomethyl]-1-piperazinyl]methyl]-4-(dimethylamino)-1,4,4a,5,5a,6,11,12a-octahydro-3,6,10,12,12a-pentahydroxy-6-methyl-1,11-dioxo-2-naphthacenecarboxamide