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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.