Synonyms: 2-Propenoic acid, 2-cyano-3-[5'''-(9-ethyl-9H-carbazol-3-yl)-3',3'',3''',4-tetrahexyl[2,2':5',2'':5'',2'''-quaterthiophen]-5-yl]-, 2-Cyano-3-[5'''-(9-ethyl-9H-carbazol-3-yl)-3',3'',3''',4-tetrahexyl[2,2':5',2'':5'',2'''-quaterthiophen]-5-yl]-2-propenoic acid; MK 2; MK 2(dye)