levo-isomer

(-)-Menthol (Levomenthol) is a levo isomer of menthol, an organic compound made synthetically or obtained from peppermint or mint oils with flavoring and local anesthetic properties. When added to pharmaceuticals and foods, menthol functions as a fortifier for peppermint flavors. It also has a counterirritant effect on skin and mucous membranes, thereby producing a local analgesic or anesthetic effect.

L-Xylose (L-(-)-Xylose), a levo-isomer of Xylose, is classified as an aldopentose-type monosaccharide.

(2R,3R)-Butane-2,3-diol (levo-2,3-Butanediol) is a constitutional isomer of butanediol found in cocoa and cocoa products, as well as isolated from cocoa butter and the roots of Ruta graveolens (rue). This stereoisomer is produced by various microorganisms through butanediol fermentation.