Abstract
Two flavonoids with an unusual 2',4',5'-trisubstituted B-ring (1 and 2), four myricetin derivatives (3-methylmyricetin-3'-O-beta-D-xylopyranoside (3), myricetin-3-O-alpha-L-rhamnopyranoside, myricetin-3-O-beta-D-galactopyranoside, and 3-methylmyricetin), and myricetin were isolated from the roots of Pteroxygonum giraldii Damm. & Diels. Their structures were elucidated using various spectroscopic methods and acid hydrolysis. Compound 1 was a new flavonoid and the NMR spectroscopic data of compounds 2 and 3 are reported for the first time.
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