Synonyms: 4-(3-(3-Carboxy-5-hydroxy-1-(tetrahydro-3-thienyl)-1H-pyrazol-4-yl)allylidene)-4,5-dihydro-5-oxo-1-(tetrahydro-3-thienyl)-1H-pyrazole-3-carboxylic acid S,S,S',S'-tetraoxide;4-{3-[3-carboxy-1-(1,1-dioxidotetrahydrothiophen-3-yl)-5-oxo-1,5-dihydro-4H-pyrazol-4-ylidene]prop-1-en-1-yl}-1-(1,1-dioxidotetrahydrothiophen-3-yl)-5-oxo-2,5-dihydro-1H-pyrazole-3-carboxylic acid