Menthol, also known as menthol, is a terpenoid organic compound with the chemical formula C 10 H 20 O。 Menthol is extracted from the leaves and stems of peppermint. It is a white crystal. It is the main component of peppermint and peppermint essential oils. There are generally two isomers of menthol (D-type and L-type), and the natural menthol is mainly left-handed is...