A method comprising catalysis of the conversion of (+)-cis-isopulegone to (R)-(+)-pulegone using a ketosteroid isomerase is disclosed. A mutated ketosteroid isomerase having (+)-cis-isopulegone to (R)-(+)-pulegone isomerase activity is also disclosed. A method comprising catalysis of the conversion of (+)-cis-isopulegone to an isopulegol isomer using a menthone reductase is also disclosed.
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