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Spectra of isomers (m/z = 262.1285) of 2-methylmalonyl carnitine (C3:M-DC) and succinyl carnitine (C4:DC) under HCD NCE 25. Figure 4A is the spectrum of C3:M-DC sampled at RT 98.7 s. The fragments at m/z 218.1388 and 159.0655 indicate that it is 2-methylmalonyl carnitine. Figure 4B is the spectrum of C4:DC sampled at RT = 82.5 s.
