Intrinsic Folding Proclivities in Cyclic β-Peptide Building Blocks: Configuration and Heteroatom Effects Analyzed by Conformer-Selective Spectroscopy and Quantum Chemistry. - Alauddin M; Gloaguen E; Brenner V; Tardivel B; Mons M; Zehnacker-Rentien A; Declerck V; Aitken DJ (Chemistry (Weinheim an der Bergstrasse, Germany), 2015)