Not less than 95.0%
2-(Benzo[b]thien-2-oyl)benzo[b]thiophene;Benzo[b]thien-2-yl ketone; Bis(benzo[b]thien-2-yl)methanone; Bis(benzo[b]thiophen-2-yl)methanone;Zileuton Related Compound B.