فهرس المقالات 4-dihydropyrano[c] chromene حرية الوصول المقاله صفحة الملخص نص كامل 1 - Lactic acid-catalyzed Eco-friendly Cyclization Reaction for the Synthesis of 4H-benzo[b]pyrans and 3,4-dihydropyrano[c]chromenes in EtOH/H2O as an Efficient Green Reaction Medium Nourallah Hazeri Mojtaba Lashkari Homayoun Faroughi Niya Hamed Pourbalouch