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The other double bonds are deduced from the biodiesel first one by adding 3 (this is the most frequent structure, non-conjugated fatty acids, but sometimes by adding 2, these double bonds are said conjugated). Thus, linoleic acid or cis-9, cis-12-octadecadienoic biodiesel acid is also named in the shorthand nomenclature 18:2 (n-6). This compound has 18 carbon atoms, 2 double bonds and 6 carbon atoms from the last double bond to the terminal methyl group. In biodiesel the old literature it was designated 18:2w6. 18-6=12, 12-3=9, hence D9,12. The International Commission on Biochemical Nomenclature agreed to the first form of this nomenclature because of its interest in describing the fatty acid metabolism. A list of common (non-systematic) names for fatty acids (by Adlof R.O. and Gunstone F.D.) with their structure and source may be found in a page of the AOCS Analytical Division.
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