Table 9-1 Some naturally occurring fatty acids Carbon stematic Common name skeleton Structure name (derivation) 12:0 CHa(CHgho COOH n-Dodecanoic Lauric acid (Latin laurus 14:0 CH3(CH2)h2 COOH n-Tetradecanoic Myristic acid nutmeg genus 16:0 CH3(CH2)COOH n-Hexadeca Palmitic acid acid Greek palma, palm tree CH3(CH2)s COOH n-Octadecanoic Stearic acid cid (Greek stear, hard fat) 20:0 CH(CH2) COOH n-Eicosanoic Arachidic acid (Latin Arachis legume genus) 24:0 CH3(CH2)22COOH n-Tetracosanoic Lignoceric acid acid (Latin lignum wood cera, wax) 69 CH了CH2万 CH-CH(CH2万CooH Palmitoleic cid 18:1(△9) CH(CH,)7CH-CH(CH,),COOH Oleic acid Greek oleum 18: 2(49. 2) CH3(CH2)4CH=CHCH2 CH=CH(CH,),COOH ar-Linoleic acid 18: 3(4.2, 5) CH3 CH=CHCH, CH=CHCH, CH-CH(CH,),COOH Linolenic acid 20: 4(468, 1 4) CH3(CH2)4CH=CHCH2 CH= CH Arachidonic acid CHCH CH=CH(CH,)3COOH