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Partial 1H NMR (500 MHz, 1:1 CDCl3:CD3OD) of a) S1 (1.0 mM), b) M5⊃S1 (1.0 mM, asterisks indicate signals for free S1), and c) M5 (1.0 mM). Atom labels are provided in Scheme 1. The cartoons show S1 (colored blue) with its two thiophene units in a trans orientation.
