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. Author manuscript; available in PMC: 2014 Sep 25.
Published in final edited form as: Chem Commun (Camb). 2013 Sep 25;49(74):10.1039/c3cc44573a. doi: 10.1039/c3cc44573a

Fig. 1.

Fig. 1

Conformational equilibria of compounds (A) 1 (X = O), (B) 2 (X = O) and 4 (X = S), and (C) 3 (X = O) and 5 (X = S). Equilibrium constants K1, K2, and K3 refer to compounds 1, 2, and 3, respectively.