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Multistage mass spectra of doxorubicin and its metabolites. (A–E) MS1∼MS5 mass fragmentation of doxorubicin, (F–J) MS1∼MS5 mass fragmentation of doxorubicin metabolites M1, (K–O) MS1∼MS5 mass fragmentation of doxorubicin metabolites M2, (P–T) MS1∼MS5 mass fragmentation of doxorubicin metabolites M3.
