High field 15N nuclear magnetic resonances spectroscopy of peptides. Assignments in viomycin sulphate
Abstract
All 13 resonances form the natural abundance 36·48 MHz 15N n.m.r. spectrum of viomycin have been observed and assignments made, largely on the basis of selective low power 1H decoupling experiments in combination with off-resonance effects, which confirm the structure of the guanidinium group at pH 2·8.