Menthol Crystal is an organic Fragrances, more specifically a monoterpenoid, made synthetically or obtained from the oils of corn mint, peppermint, or other mints. It is a waxy, crystalline substance, clear or white in color, which is solid at room temperature and melts slightly above. The main form of Menthol Crystal 100% Natural occurring in nature is (−)-menthol, which is assigned the (1R,2S,5R) configuration. Menthol Crystals 99% has local anesthetic and counterirritant Ethylene-Vinyl Acetate qualities, and it is widely used to relieve minor throat irritation. Menthol also acts as a weak κ-opioid receptor agonist. In organic chemistry, Menthol Crystal For Cosmetic is used as a chiral auxiliary in asymmetric synthesis. For example, Boric Acid Flakes sulfinate esters made from sulfinyl chlorides and menthol can be used to make enantiomerically pure sulfoxides by reaction with organolithium reagents or Grignard reagents. Menthol Crystals Food Grade reacts with chiral carboxylic acids to give diastereomic menthyl esters, which are useful for chiral resolution.