A. Khalaj et al., NMR evidence for cationic behaviour of the benzotriazole ring in novel alpha-(benzotriazol-1-yl)-N-acylglycines, J CHEM R-S, (10), 2001, pp. 412-413
Spin coupling of a proton to a nitrogen in the benzotriazole ring of novel
alpha-(benzotriazol-1-yl)-N-acylglycines 1-3 revealed the zwitterionic prop
erties of these compounds.