36504-67-3 7,8,9,10-Tetrahydro-BP-7,8-oxide 7,8-Epoxy-7,8,9,10-tetrahydrobenzo(a)pyrene 9,10-Dihydrobenzo(a)pyrene-7,8-epoxide BENZO(a)PYRENE, 7,8,9,10-TETRAHYDRO-7,8-EPOXY-