ZnAl₂O₄ Nanoparticles as Efficient and Reusable Heterogeneous Catalyst for the Synthesis of 12-phenyl-8,12-dihydro-8,10-dimethyl-9H-naphtho[1′,2′:5,6] pyrano[2,3-d] pyrimidine-9,11-(10H)-diones Under Microwave Irradiation

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