Maghsoodlou MT, Masoumnia A, Mousavi MR, Hazeri N, Aboonajmi J, Habibi-Khorasani SM, et al. A green protocol for synthesis of pyran annulated hetrocyclic systems using Na2SO4 as an efficient catalyst. Iran. J. Catal. 2024 Feb. 3;5(2). Available from: https://oiccpress.com/ijc/article/view/3841