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High-resolution mass spectrometry (HRMS/MS) spectra from fragmentations of [M − H]− ions of (A) (7E)-9-oxohexadec-7-enoic acid (m/z 267.2139), (B) (10E)-9-oxohexadec-10-enoic acid (m/z 267.2164) and the assigned structurally informative fragmentations of these ions.
