Common Name Systematic Name Formula Common source II. Unsaturated Fatty Acids A. Monoethenoic Acids Oleic Cis 9-octadecenoic C17H33COOH plant and animal fats Elaidic Trans 9-Octadecenoic C17H33COOH animal fats B. Diethenoic Acids Linoleic 9,12-Octadecadienoic C17H31COOH peanut, linseed, and cottonseed oils C. Triethenoid Acids Linolenic 9,12,15-Octadecatrienoic C17H29COOH linseed and other seed oils Eleostearic 9,11,13-Octadecatrienoic C17H29COOH peanut seed fats D. Tetraethenoid Acids Moroctic 4,8,12,15- Octadecatetraenoic C17H27COOH fish oils Arachidonic 5,8,11,14- Eicosatetraenoic C19H31COOH traces in animal fatsCommon Name Systematic Name Formula Common source II. Unsaturated Fatty Acids A. Monoethenoic Acids Oleic Cis 9-octadecenoic C17H33COOH plant and animal fats Elaidic Trans 9-Octadecenoic C17H33COOH animal fats B. Diethenoic Acids Linoleic 9,12-Octadecadienoic C17H31COOH peanut, linseed, and cottonseed oils C. Triethenoid Acids Linolenic 9,12,15-Octadecatrienoic C17H29COOH linseed and other seed oils Eleostearic 9,11,13-Octadecatrienoic C17H29COOH peanut seed fats D. Tetraethenoid Acids Moroctic 4,8,12,15- Octadecatetraenoic C17H27COOH fish oils Arachidonic 5,8,11,14- Eicosatetraenoic C19H31COOH traces in animal fats