The 310helical conformation of a pentapeptide containing α-aminoisobutyric acid (Aib): X-ray crystal structure of Tos–(Aib)5–OMe

Abstract
The pentapeptide Tos–(Aib)5–OMe adopts a 310 helical conformation in the solid state, with three consecutive Type III β-turns stabilised by intramolecular hydrogen bonds.