Conjugated linoleic acids precursors

Mahon, M JL Belury. Conjugated linoleic acids (CLA) as precursors of a distinct femily of PUFA. 1143—1146 (2004). 

Further oxidation of oleic to linoleic acid (which contains one additional non-conjugated double bond) and then to crepenynic acid (which introduces the first triple bond) eventually leads to the tridecapen-taynene shown in Scheme 1, thought to be a more immediate precursor to all the dithiophenes and trithiophenes discussed here. Since bi- and trithiophenes are often found in plants with polyacetylenic compounds, a close biological relationship between these compounds is certainly plausible. 

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