1a,2,3,11c-Tetrahydrobenzo(6,7)phenanthro(3,4-b)oxirene-2,3-diol (1aalpha,2alpha,3beta,11calpha)- 63493-01-6 Benzo(6,7)phenanthro(3,4-b)oxirene-2,3-diol, 1a,2,3,11c-tetrahydro-, (1aalpha,2alpha,3beta,11calpha)-