1,2-Dichlorobenzo[b]thiophene 2,3-Dichlorothianaphthene 2,3-Dichlorothionaphthene 5323-97-7 Benzo[b]thiophene, 2,3-dichloro- NSC2838 Thianaphthene, 2,3-dichloro- WLN: T56 BSJ CG DG