Showing structure for (4s,4as,5ar,12as)-9-{[2-(tert-butylamino)-1-hydroxyethylidene]amino}-4,7-bis(dimethylamino)-3,10,12,12a-tetrahydroxy-1,11-dioxo-4a,5,5a,6-tetrahydro-4h-tetracene-2-carboximidic acid