2,4-Dihydro-4,4-bis(5-hydroxy-3-methyl-1-phenyl-1H-pyrazol-4-yl)-5-methyl-2-phenyl-3H-pyrazol-3-one can be studied from reactions of 6-amino-5-cyano-3-methyl-1,4-diphenyl-1H,4H-pyrano[2,3-c]pyrazole; a novel synthesis of 4-arylidene-3-methyl-1-phenyl-2-pyrazolin-5-one derivatives.
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