Fig. 7. Rheological properties of the gels formed by compound 17 (EtOH : H₂O, 1 : 2, 2.5 mg mL⁻¹), compound 20 (EtOH : H₂O, 1 : 1, 3.3 mg mL⁻¹), compound 20 (EtOH : H₂O, 1 : 2, 2.5 mg mL⁻¹), compound 20 (DMSO : H₂O, 1 : 1, 4.0 mg mL⁻¹) and compound 20 (toluene, 2.8 mg mL⁻¹). Applied strain was 1% for all the samples, all solvent ratios are volume ratios.