Synonyms: dipotassium 4-[(3-oxobenzo[b]thien-2(3H)-ylidene)methyl]benzene-1,3-disulphonate;Dikalium-4-((3-oxobenzo(b)thien-2(3H)-yliden)ulfonat;1,3-Benzenedisulfonic acid, 4-((2,3-dihydro-3-oxobenzothiophen-2-ylidene)methyl)-, dipotassium salt;1,3-Benzenedisulfonic acid, 4-((3-oxobenzo(B)thien-2(3H)-ylidene)methyl)-, dipotassium salt;1,3-Benzenedisulfonic acid, 4-((3-oxobenzo(B)thien-2(3H)-ylidene)methyl)-, potassium salt (1:2);2-(2,4-Disulfobenzylidene)-3-oxo-2,3-dihydrobenzo(B)thiophene, dipotassium salt;Einecs 266-141-7