For purification, isopulegol mainly composed of (-)-n-isopulegol is deep cooled in a solvent mainly comprising acetone to obtain (-)-n-isopulegol having a chemical purity of not less than 99.7% by weight, and an optical purity of not less than 99.7%e.e. The thus-purified (-)-n-isopulegol is odorless and imparts a feeling of freshness, crispness and coolness to a citrus perfume composition when present in an amount of 3 - 30% by weight.
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