New Alpha-Amylase Inhibitory Metabolites from Pericarps of <i>Garcinia mangostana</i> oleh Nabil Abdulhafiz Alhakamy, Gamal Abdallah Mohamed, Usama Ahmed Fahmy, Basma Ghazi Eid, Osama Abdelhakim Aly Ahmed, Mohammed Wanees Al-Rabia, Amgad Ibrahim Mansour Khedr, Mohammed Zahid Nasrullah, Sabrin Ragab Mohamed Ibrahim