label: 1,2-epoxy-3,4-dihydroxy-1,2,3,4-tetrahydrobenzo(c)phenanthrene, (1aR-(1aalpha,2beta,3alpha,11dalpha))-isomer
label_lc: 1,2-epoxy-3,4-dihydroxy-1,2,3,4-tetrahydrobenzo(c)phenanthrene, (1ar-(1aalpha,2beta,3alpha,11dalpha))-isomer