4,7-Dimethyl-2-(3-oxobenzo(b)thien-2(3H)-ylidene)benzo(b)thiophen-3(2H)-one 4,7-Dimethyl-2-(3-oxobenzo(b)thien-2(3H)-ylidene)benzo(b)thiophene-3(2H)-one 68516-80-3 Benzo(b)thiophen-3(2H)-one, 4,7-dimethyl-2-(3-oxobenzo(b)thien-2(3H)-ylidene)- EINECS 271-182-9