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The microbial transformation studies of 7-O-prenylquercetin (1), 4′-O-prenylquercetin (2) and quercetin (3) were investigated with 20 different microbial strains to discover new metabolites. It was revealed that the fungus Mucor hiemalis was the most appropriate micro-organism which was capable of transforming these flavonoids. Structures of the three new (4–6) and one known (7) metabolites were elucidated as 7-O-prenylquercetin 3-O-β-D-glucopyranoside (4), 4′-O-prenylquercetindoi:10.6084/m9.figshare.5331271.v1 fatcat:n5blirncqrbyjdvfettn3l6i4e