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. 2022 Jan 25;54(2):241–250. doi: 10.1007/s00726-021-03109-1

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Scheme 3. — Proposed regioselective stepwise formation of complementary [y-H₂O]¯ (m/z 128) and [lpb + O]¯ (m/z 255) product anions through ion–dipole complex molecular isomerization