As the first step in the development of a liquid chromatographic/tandem mass spectrometric method for the quantitation of cocaine, its metabolites and its pyrolytic degradation products from biological matrices, the collision-induced dissociation of the protonated and selected deuterium-labeled species was studied. The fragment ions generated from the CID mass spectra were assigned and fragmentation mechanisms were proposed.
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Wang et al. (1998) studied this question.