Aegle marmelos (Rutaceae) is a deciduous shrub or tree and typically known as bael throughout Southeast Asia and has been used as a medicinal plant and a food ingredient. In this study eight compounds were determined to be O-(3,3-dimethylallyl) halfordinol (1), (R)-aegeline (2), (R)-marmeline (3), imperatorin (4), xanthotoxol (5), valencic acid (6), vanillic acid (7) and rutin (8). The chemical structures of the isolates were elucidated through spectroscopic evidence including 1D, 2D NMR, ESI-Q-TOF-MS and optical rotation.

Orthosiphon aristatus (Lamiaceae) is a perennial herbaceous plant native to tropical Southeast Asia countries. The chemical investigation on this plant led to the isolation and structure elucidation of a new vomifoliol derivative (1) along with eighteen known phenolic compounds [cystosiphonin (2), 5,7,8-trimethoxyflavanone (3), scutellarein-7,4′-methylether (4), eupatorin (5), 5,6,7,8,4′-pentamethoxyflavone (6), 5,6,7,4′-tetramethylscutellarein (7), 5,6,7,8,3′,4′-hexamethoxyflavone (8), 6-hydroxy-5,7,4′-trimethoxyflavone (9), 6,7,8,3′,4′-pentamethoxyflavone (10), 5,6,3′-trihydroxy-7,4′-dimethoxyflavone (11), 5,6-dihydroxy-7,3′,4′-trimethoxy flavone (12), 4′-hydroxy-5,6,7,3′-tetramethoxyflavone (13), 2′-hydroxy-3,4,4′,5′,6′-pentamethoxy-chalcone (14), isoquercetin (15), quercetin 3-O-α-L-arabinopyranosyl (1→6)-β-Dglucopyranoside (16), caffeic acid (17), rosmarinic acid (18), and (6S,9R)-roseoside (19)]. The structures of isolates were confirmed via spectroscopic data such as one- and two-dimensional nuclear magnetic resonance,circular dichroism, mass, ultraviolet and optical rotation.

Diospyros burmanica Kurz. is an evergreen deciduous tree distributed in Mandalay of Myanmar, which belongs to the family of Ebenaceae. In Myanmar, it has been used to treat diarrhea, diabetes, diabetes and also as lumbers. In this study, seven flavonoids (1 - 7), a phenolic compound (8), and five triterpenes (9 - 13) were isolated from the barks of D. burmanica and their chemical structures were elucidated. Isolates were identified to be (+)-catechin (1), (+)-catechin 3-O-alpha-L-rhamnopyranoside (2), (+)-catechin 3-O-gallate (3), (-)-epicatechin (4), (-)-epicatechin 3-O-gallate (5), (+)-afzelechin 3-O-alpha-L-rhamnopyranoside (6), (+)-2,3-trans-dihydrokaempferol 3-O-alpha-L-rhamnopyranoside (7), methyl gallate (8), lupeol (9), methyl lup-20(29)-en-3-on-28-oate (10), beta-amyrin (11), alpha-amyrin (12), 3beta-hydroxy-D:B-friedo-olean-5-ene (13) through MS, 1H NMR and 13C NMR spectroscopic evidences.
Catechin ; Diarrhea ; Diospyros* ; Ebenaceae ; Flavonoids ; Humans ; Myanmar ; Phenol* ; Trees ; Triterpenes*