Mir, Fatemeh, Hazeri, Nourallah, Maghsoodlou, Malek Taher, Lashkari, Mojtaba. Synthesis of Pyrazolopyranopyrimidine and Dihydropyrano[2,3-c]pyrazole Derivatives using Vitamin D as an Efficient Catalyst under Green Condition. Journal of Applied Chemical Research. 2023;17(1):72-86. doi: