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7-AI monomer, dimer and tautomer forms from reference [113]. Reprinted with permission from (Takeuchi, S.; Tahara, T. The Answer to Concerted versus Step-Wise Controversy for the Double Proton Transfer Mechanism of 7-Azaindole Dimer in Solution. Proceedings of the National Academy of Sciences 2007, 104, 5285–5290). Copyright (2007) National Academy of Sciences, U.S.A.
