3,4-dihydroxy-1,2-epoxy-1,2,3,4-tetrahydrobenz(a)anthracene, (1aS-(1aalpha,2alpha,3beta,11calpha)-)-isomer
3,4-dihydroxy-1,2-epoxy-1,2,3,4-tetrahydrobenz(a)anthracene, (1as-(1aalpha,2alpha,3beta,11calpha)-)-isomer