4,9-Dimethyl-2,3,5,6-dibenzothiophenthrene 4-17-00-00770 (Beilstein Handbook Reference) 63042-50-2 7,13-Dimethylbenzo(b)phenanthro(3,2-d)thiophene BENZO(b)PHENANTHRO(3,2-d)THIOPHENE, 7,13-DIMETHYL- BRN 0029547