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. Author manuscript; available in PMC: 2013 Apr 23.
Published in final edited form as: Angew Chem Int Ed Engl. 2012 Feb 29;51(17):4204–4208. doi: 10.1002/anie.201109149

Figure 1.

Figure 1

a) The equilibrium of autoinducer-2 (AI-2/1) as typically described in the literature (black color) and the equilibrium identified in this study (red color). The diketone species A is in equilibrium with B1 and B2 which are hydrated to grant C1 and C2. The borate species D was discovered as the active species in V. harveyi. Species E is proven as the major linear structure in this study. b) DPD analogues described in the current study.