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Three new metabolites from the marine yeast aureobasidium pullulans

Two new diketopiperazines (1 and 2) with a d-cis-4-hydroxyproline residue, and orcinotriol (3), a new 1,3-dihydroxyphenol derivative, were isolated from cultured broth of the yeast Aureobasidium pullulans, which was isolated from an Okinawan marine sponge. The structures of the compounds, including their absolute stereochemistries, were determined by spectroscopic data and chemical means.