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. Author manuscript; available in PMC: 2016 Dec 2.
Published in final edited form as: J Am Chem Soc. 2015 Sep 18;137(38):12369–12377. doi: 10.1021/jacs.5b07726

FIGURE 3.

FIGURE 3

X-ray crystal structure of Boc-Dmaa-d-Pro-Acpc-Leu-NMe2 (4q).24 Two different conformations of 4q are present in the unit cell, both of which show intramolecular hydrogen bonds characteristic of type II’ β-turns.21