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(4S,4aS,5aR,12aS)-4,7-Bis(dimethylamino)-9-[[2-[(1,1-dimethylethyl)amino] acetyl]amino]-1,11-dioxo-1,4,4a,5,5a,6,11,12a-octahydro-3,10,12,12a-tetrahydroxy-2-naphthacenecarboxamide