4-(3-(4-(Dimethylamino)phenyl)allylidene)-4,5-dihydro-5-oxo-1-(4-sulphophenyl)-1H-pyrazole-3-carboxylic acid, compound with pyridine(1:1);(4Z)-4-{(2E)-3-[4-(dimethylamino)phenyl]prop-2-en-1-ylidene}-5-oxo-1-(4-sulfophenyl)-4,5-dihydro-1H-pyrazole-3-carboxylic acid - pyridine (1:1)
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