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The title reaction produces 6-amino-3,3’-dimethyl-5’-oxo-1,1’-diphenylspiro[pyrano[2,3c]pyrazole -4(1H),4’-[2]-pyrazoline]-5-carbonitrile 4, the structure of which has been determined by X-ray crystallography. It crystallizes in the orthorhombic space group Pna21, with two independent molecules in the asymmetric unit.

Heterocyclic tautomerism, part 12. The structure of the product of reaction between 3-methyl-1-phenyl-2-pyrazolin-5-one and tetracyanoethylene