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. 2014 Jul 14;79(15):6766–6774. doi: 10.1021/jo501101s

Figure 1.

Figure 1

Crystal structures and 2D representations of (a) free base guanidine,16 (b) a guanidinium carboxylate salt,20 (c) a propylguanidinium phosphate salt,21 and (d) a sulfate salt of a synthetic bisguanidinium receptor.22