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1-({[(E)-[(4R,4aR,5aR,6S,12aR)-4-(dimethylamino)-6,10,11,12a-tetrahydroxy-6-methyl-1,3,12-trioxo-3,4,4a,5,5a,6,12,12a-octahydrotetracen-2(1H)-ylidene](hydroxy)methyl]amino}methyl)-L-proline related products: