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Separation and identification of short-chain acylcarnitine isomers. (a) In the LC-MS/MS analysis of acylcarnitine isomers, isobutyrylcarnitine is detected at 17.282 min and butyrylcarnitine at 18.042. (b) Product ion scan of m/z 288 for both isobutyrylcarnitine and butyrylcarnitine.
