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CID Fragmentation of ε-N-modified lysine. The mass of R2 for DFP can be +164 for diisopropoxyphosphate, or +80 for DFP that has lost both isopropyl groups. The mass of R2 for CPO can be +136 for diethoxyphosphate, or +108 for monoethoxyphosphate, or +80 for is indicated as CPO that has lost both ethoxy groups. The immonium ion minus NH3 immonium-NH3.
