2-(5-Oxobenzo(4,5)phenaleno(1,9-bc)thien-2(5H)-ylidene)benzo(4,5)phenaleno(1,9-bc)thiophen-5(2H)-one 6505-58-4 Benzo(4,5)phenaleno(1,9-bc)thiophen-5(2H)-one, 2-(5-oxobenzo(4,5)phenaleno(1,9-bc)thien-2(5H)-ylidene)- EINECS 229-392-3