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Electron ionization mass spectrum of IsoFs isolated from an incubation after oxidation of arachidonic acid in vitro. Compounds were analyzed as a methyl ester, TMS ether derivative. In this mixed mass spectrum, the IsoF regioisomer shown appears to predominate this part of the spectrum, by way of assignment of the m/z 181 base ion. OTMS and TMSO indicate trimethylsilyl ether groups. The assignment of fragment ions to other regioisomers is outlined in Fig. 8.
