Identification of Chemical Constituents from Polygonum chinense Linn.

Twelve chemical constituents were isolated from Polygonum chinense Linn. On the bases of spectral data, they were identified as syringic acid (1), apigenin (2), 3,3'-di-O-methylellagic acid (3), gallic acid (4), protocatechuic acid (5), isorhamnetin (6), caffeic acid (7), quercetin (8), luteolin (9), gallicin (10), avicularin (quercetin-3-O-α-L-arabinofuranoside)(11) and 3,4,8,9,10-pentahydroxy-dibenzo [b,d]pyran-6-one (12). All these compounds except 4 and 8 were reported from the species for the first time.