[Studies on the chemical comstituents of Pithecellobium clypearia].
OBJECTIVE
To study the chemical constituents of Pithecellobium clypearia.


METHODS
The compounds were isolated from Pithecellobium clypearia with column chromatography. Their structures were characterized on the basis of their physical and chemical preperties, as well as chromatographic and spectroscopic evidences.


RESULTS
A pair of isomeric flavans consisting of 7, 3'-O-di-gallyoltricetiflavan (I) and 7,4'-O-di-gallyoltricetiflavan (II), along with a catechin compound (-)-epigallocatechin-7-O-gallate (III) were isolated from the leaves and twigs of Pithecellobium clypearia.


CONCLUSIONS
Compound I is a new flavan. Compound III is isolated from Pithecellobium genus for the first time, and its 13C-NMR data is firstly given in the present study.
Su
Miao-Xian
MX
The Chinese University of Hong Kong, N. T., Hong Kong, China.
Tang
Zhi-Yue
ZY
Huang
Wei-Huan
WH
Li
Yao-Lan
YL
Cen
Ying-Zhou
YZ
D000998:Antiviral Agents / Q000737:chemistry / Q000302:isolation & purification; D002392:Catechin / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification; D002851:Chromatography, High Pressure Liquid; D007887:Fabaceae / Q000737:chemistry*; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D018515:Plant Leaves / Q000737:chemistry; D018547:Plant Stems / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D013237:Stereoisomerism
D000998:Antiviral Agents; D005419:Flavonoids; D002392:Catechin; C045651:epigallocatechin gallate