There are many kinds of salicylic acid esters belonging to spices, among which the most commonly used are methyl salicylate, isoamyl salicylate, and benzyl salicylate. The content of methyl salicylate in birch bark oil is 96%, and there is also a certain content in essential oils such as cinnamon oil, ylang-ylang oil, violet oil and tuberose oil. Isoamyl salicylate is the most important species in amyl esters, and it is the main ingredient for blending clover flavor. It is used as a multi-tone mixture and fixative when preparing carnation essence. It can be well blended with oakmoss extract, scented perilla oil, geraniol, etc. This product is a raw material for organic synthesis. Also used as soap flavor and solvent.