Two new compounds, named (Z)-7,4′-dimethoxy-6-hydroxyaurone-4-O-β-glucopyranoside (1) and (-)-4-O-(4-O-β-D-glucopyranosylcaffeoyl)quinic acid (2), were isolated from the endophytic fungus Penicillium citrinum of Avicennia marina. Their structures were elucidated on the basis of spectroscopic analysis. Additionally, compound 2 exhibited potent chemoreversal activity, mainly by inhibiting P-glycoprotein efflux pump function.
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