Methyl salicylate (also known as betula oil , oil of wintergreen, methyl ester ) ( chemical formula C6H4(HO)COOCH3) is the natural extract of wintergreen. Structurally, it is methylated salicylic acid. It is used as a flavoring and as an ingredient in deep heating rubs. It also has the property of fluorescence, converting ultraviolet light into visible blue light. This is most apparent in Wint-O-Green Lifesavers, which contain methyl salicylate as their flavoring. Esters