Common fatty acid Unsaturated fatty acid 16:1△9℃ CH;(CH);CH=CH(CH2)COOH. Palmitoleic acid 18:1A9℃ CH(CH2)CH=CH(CH2)COOH. Oleic acid 18:2△c,12c CH(CH2)CH=CHCH CH=CH(CH2)COOH.I Linoleic acid 18:3 CH,CH2CH=CHCH CH=CHCH2 CH=CH △9C12C,15C Linolenic acid -(CH2)COOH. 20:4 CH(CH)CH=CHCH CH=CHCH,CH=CH A5C8C,HIC,14C Arachidonic acid -CH2CH=CH(CH)COOH.Common fatty acid Saturated fatty acid Unsaturated fatty acid