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Comparison of the collisionally induced dissociation spectrum for the precursor ion observed at m/z = 338 in the natural sample to that of an authentic sample. (A) Synthetic N-(tetrahydro-2-oxo-3-furanyl)-9-cis-hexadecenamide recorded for precursor ion m/z = 338. (B) Same scan carried out on the semipurified natural material.
