is an organic unsaturated fatty acid derived from natural castor oil. It is the common name of the 10-undecenoic acid (CH2CH(CH2)8COOH). It is used in the manufacture of pharmaceuticals, cosmetics and perfumery including anti-dandruff shampoos, anti-microbial powders and as a musk in perfumes and aromas. Undecylenic acid is produced by cracking of Castor oil under pressure.
