(alpha,beta,alpha,alpha)-stereoisomer of 11,12-dihydroxy-13,14-epoxy-11,12,13,14-tetrahydrodibenzo(a,l)pyrene
(alpha,beta,alpha,alpha)-stereoisomer of 11,12-dihydroxy-13,14-epoxy-11,12,13,14-tetrahydrodibenzo(a,l)pyrene