1H-Pyrazole-3-carboxylic acid, 4-(3-(3-carboxy-5-hydroxy-1-(4-sulfophenyl)-1H-pyrazol-4-yl)-2-propen-1-ylidene)-4,5-dihydro-5-oxo-1-(4-sulfophenyl)-, sodium salt, compd. with N,N-diethylethanamine (1:?:?);4-(3-(3-Carboxy-5-hydroxy-1-(4-sulfophenyl)-1H-pyrazol-4-yl)-2-propenylidene)-4,5-dihydro-5-oxo-1-(4-sulfophenyl)-1H-pyrazole-3-carboxylic acid, sodium and triethylamine salts;1H-Pyrazole-3-carboxylic acid, 4-(3-(3-carboxy-5-hydroxy-1-(4-sulfophenyl)-1H-pyrazol-4-yl)-2-propenylidene)-4,5-dihydro-5-oxo-1-(4-sulfophenyl)-, sodium salt, compd. with N,N-diethylethanamine;4-(3-(3-Carboxy-5-hydroxy-1-(4-sulphophenyl)-1H-pyrazol-4-yl)allylidene)-4,5-dihydro-5-oxo-1-(4-sulphophenyl)-1H-pyrazole-3-carboxylic acid, sodium salt, compound with triethylamine;tetrasodium 4-{(1E,3Z)-3-[3-carboxylato-5-oxo-1-(4-sulfonatophenyl)-1,5-dihydro-4H-pyrazol-4-ylidene]prop-1-en-1-yl}-5-oxo-1-(4-sulfonatophenyl)-2,5-dihydro-1H-pyrazole-3-carboxylate - N,N-diethylethanamine (1:1)