6,12-Dimethylbenzo(1,2-b:4,5-b')dithionaphthene , its cas register number is 37750-86-0. It also can be called 4-19-00-00437 (Beilstein Handbook Reference) ; BRN 0032953 ; Benzo(1,2-b:4,5-b')bis(1)benzothiophene, 6,12-dimethyl- .