Of 12 Gymnospermae seed and leaf oils, only 2 contained cyclopropene fatty acids. All‐cis 5, 11, 14, 17‐eicosatetraenoic acid occurred in concentrations up to 11.9% in 6 seed oils, and up to 61% in 2 leaf oils. The structure of this acid, as its methyl ester, was established by the combination of physical (UV, IR,1H‐ and13C‐NMR and mass spectra) and chemical techniques. Arachidonic acid also occurred in 2 seed oils.
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Vickery et al. (1984) studied this question.
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