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The authors regret that their paper did not cite, and partially reproduced data from, a previously published article (J-C. Bolsée, W. D. Oosterbaana, L. Lutsen, D. Vanderzandea, J. Manca, Org. Electron. 2011, 12, 2084).

The corresponding authors sincerely apologize to the readers, reviewers, and editors for this oversight.