ChemInform Abstract: New Convenient Four-Component Synthesis of 6-Amino-2,4-dihydropyrano[2,3-c]pyrazol-5-carbonitriles and One-Pot Synthesis of 6′-Aminospiro[(3H)-indol-3,4′-pyrano [2,3-c]pyrazol]-(1H)-2-one-5′-carbonitriles.

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