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