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