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Chemical structures of phenolic compounds in the guava leaf extract that were detected by liquid chromatography–mass spectrometry: (a) catechin comprising of (+)-catechin (2R,3S) and (−)-catechin (2S,3R); (b) caffeic acid; (c) gallic acid; (d) naringenin; (e) naringin; (f) quercetin; (g) rosmarinic acid; (h) rutin. All chemical structures were acquired from PubChem database [27] and visualized by ChemDraw (version 22, PerkinElmer Informatics).
