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VCD spectra of zwitterionic AXA peptides at 1,500–1,750 cm-1. The solid lines resulted from a calculation based on the dihedral angles obtained from the analysis of the IR and Raman band profiles of amide I′, as described in the text. The AKA couplet in Top reflects the cationic state, and that in Middle is the zwitterionic state of the terminal groups.
