Figure 10.
Positive-ion ESI-MS (a), MS/MS of the [M – H]– ion of 15N-d(C∧pC) (b), and MS3 of the protonated ions of the base portion of the cross-link from 15N-d(C∧pC) (c) and d(C∧pC)-15N (d). Data were acquired on an ion-trap mass spectrometer.
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