1, prepared by methylation of corresponding hydroxymethylbenzaldehyde with dimethyl sulfate in alkaline solution.

2. Vanillin was used as raw material to react with dimethyl sulfate in alkaline solution.

3. Using catechol as raw material, catechol and dimethyl sulfate were methylated in alkaline solution to obtain the product, and veratrum ether was formylated with N- methylbenzoyl aniline to obtain the product.

4. There are natural products in lemongrass.