Synonyms: 3-(2-(3-Ethyl-4-oxo-2-thioxothiazolidin-5-ylidene)-5-(methylthio)-1,3,4-thiadiazol-3(2H)-ylidene)propanesulphonic acid, compound with pyridine (1:1);(3Z)-3-[(2Z)-2-(3-ethyl-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene)-5-(methylsulfanyl)-2,3-dihydro-1,3,4-thiadiazol-3-ium-3-ylidene]propane-1-sulfonate - pyridine (1:1)