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.