Continuous exploration of the chemical constituents of Combretaceous p
lants has led to the discovery of two novel ellagitannins, quisqualin
A (1) and quisqualin B (2), from the fruits of Quisqualis indica. A to
tal of twenty-one other tannins were also isolated from either the fru
its or leaves of e. indica. including [I] eleven ellagitannins: 2,3-(S
)-HHDP-D-glucose (3), 2,3-(S)-HHDP-4-O-galloyl-D-glucose (4), 2,3-(S)-
HHDP-6-O-galloyl-D-glucose (5), 2,3-(S)-HHDP-4,6-di-O-galloyl-D-glucos
e (6), pedunculagin (7), punicalagin (8), eugeniin (9), 1-desgalloyleu
geniin (10), casuariin (11), 5-desgalloylstachyurin (12), castalagin (
13); [II] five gallotannins: 6-O-galloyl-D-glucose (14), 1,6-di-O-gall
oyl-beta-D-glucose (15), 2,3-di-O-galloyl-D-glucose (16), 3,4-di-O-gal
loyl-D-glucose (17), 4,6-di-O-galloyl-D-glucose (18); [III] four pheno
lcarboxylic acids: gallic acid (19), ellagic acid (20), flavogallonic
acid (21), brevifolin carboxylic acid (22) and [IV] one other hydrolyz
able tannin: punicalin (23).