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a) Structure of BTA1. R,R’R’’ are alkyl chains/other substituents. b) Three-fold hydrogen intermolecular bonding and helical assembly of BTA.
3B: Adapted with permission from P.J.M. Stals, J.F. Haveman, A.R.A. Palmans, A.P.H.J. Schenning, J. Chem. Educ. 2009, 86, 230. Copyright 2009, American Chemical Society.
