Showing structure for (3R,3aS,4S,4aS,5S,8S,8aS,9R,9aS)-4-((4-(4-(bis(2-chloroethyl)amino)phenyl)butanoyl)oxy)-5-hydroxy-3,5,8a-trimethyl-2-oxododecahydronaphtho[2,3-b]furan-8,9-diyl diacetate