Fig. 2. (a) An opaque gel formed by compound 13 in EtOH/H2O (v/v 1 : 1) at 10 mg mL−1; (b) an opaque gel formed by compound 17 in EtOH/H2O (v/v 1 : 2) at 2.5 mg mL−1; (c) a transparent gel formed by compound 20 in i-PrOH at 10.0 mg mL−1.
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