M 1949 (OTTO) 3-Methyl benzaldehyde, 97% Cas 620-23-5 - used as a fragrance agent in food and cosmetics. M 1949 (OTTO) 3-Methyl benzaldehyde, 97% Cas 620-23-5 - used as a reagent in the preparation of a wide range of pharmaceutical compounds such as anti-inflammatory agents.