Angiotensin Converting Enzyme (ACE) Inhibition Activity by Syzygium polyanthum Wight (Walp.) Leaves: Mechanism and Specificity, Ismail, A, Anuar TAFT, Suffian IFM, Hamid AA Abdul, Omar MN, Mustafa BE, and Ahmad WAN Wan , Pharmacognosy Journal, February 2022, Volume 14, Issue 1, p.76-84, (2022)