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(A) LC/MS2 product ion mass spectra of AαC-N2-Gluc (m/z 360.1 >) and LC/MS3 product ion mass spectra of (B) AαC-6-O-Gluc (m/z 376.1 > 200.1 >), (C) AαC-3-O-Gluc (m/z 376.1 > 200.1 >), (D) AαC-6-O-SO3H (m/z 280.1 > 200.1 >), (E) AαC-3-O-SO3H (m/z 280.1 > 200.1 >) in positive ionization mode. The proposed mechanism of formation of the prominent fragment ion of AαC-3-OH at m/z 155.0 is presented.
