Abstract
Two new compounds, named as rhamnocitrin-3-O-β-d-glucopyranosyl-4′-O-β-d-galactosyl-(1→3)-O-β-d-glucopyranoside (1), and (3R)-5,6,7-trihydroxy-3-isopropyl-3-methylisochroman-1-one (2), were isolated from the seeds of Alpinia katsumadai Hayata. Their structures were elucidated on the basis of spectroscopic analysis. Additionally, compounds 2 exhibited potent neuroprotective activity on 1-methyl-4-phenylpyridinium-induced oxidative damage in PC12 cells.
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