4-(4-(3-(4-(Dimethylamino)phenyl)allylidene)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)benzenesulphonic acid, compound with pyridine (1:1);4-[(4Z)-4-{(2E)-3-[4-(dimethylamino)phenyl]prop-2-en-1-ylidene}-3-methyl-5-oxo-4,5-dihydro-1H-pyrazol-1-yl]benzenesulfonic acid - pyridine (1:1)
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