Tumonoic Acids K and L, Novel Metabolites from the Marine-Derived Fungus Penicillium citrinum

Three new compounds, namely tumonoic acids K (1), L (2), and methyl 2-(2-acetyl-3,5-dihydroxy-4,6-dimethylphenyl)acetate ( 3), together with nine known compounds, were isolated from the marine-derived fungus Penicillium citrinum.The structures of these compounds were elucidated by spectroscopic methods and chemical derivatization.This study is the first to report on tumonoic acid analogues derived from a fungus.