4-METHOXY BENZALDEHYDE has a hawthorn like odor. Mainly used as spices, preparation of flower flavor flavor, used in food and cosmetics, soap and so on. In medicine, it is used as an intermediate of antihistamine drugs, such as making the antibiotic hydroxylaminobenzyl penicillin, etc., and a small amount is also used as an electroplating brightener. In the sunscreen industry, it is used to produce isooctyl p-methoxycinnamate and isoamyl p-methoxycinnamate.