Gondoic Acid is a monounsaturated long-chain fatty acid having 20-carbon backbone and the sole double bond which originates from the 5th, 6th, 7th, 9th, 11th 12th or 15th positions from the methyl end. Long chain fatty acids are fatty acids having aliphatic tail which contains between 13 and 21 carbon atoms. Practically it is insoluble in water and a weakly acidic compound which is based on its pKa. This monounsaturated omega-9 fatty acid is found in various plant oils and nuts. It is found in red cell membrane with upsurge concentrations in children with regressive autism. It is a conjugate acid of gondoate.