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Product ion mass spectra and assigned fragmentation pattern for hydroxylated 4-methoxy-α-PVP for metabolites: a the di-hydroxylated metabolite on the pyrrolidine ring M6, b the monohydroxylated metabolite on the pyrrolidine ring M4, and c the ring opening and hydroxylated metabolite M5. The exact location of the di-hydroxylated metabolite is unknown; however, the position of the hydroxyl group at the 2″ in M4 is suggested based on previously identified α-pyrrolidine metabolites
