1,2-Benzo-9-thiafluorene 11-Thiabenzo(a)fluorene 239-35-0 BENZO(B)NAPHTHO(2,1-D)THIOPHENE Benzo(a)dibenzothiophene Benzo(b)naphtho(2,1-d)thiophene (8CI)(9CI) CCRIS 4012 EINECS 205-948-0 NSC 89259 Naphtho(1,2-b)thianaphthene