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

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