Fig. 6. Scanning electron micrographs for several gels: (a and b) compound 17 in EtOH : H2O (v/v 1 : 1) at 2.5 mg mL−1, (c and d) compound 18 in EtOH : H2O (v/v 1 : 1) at 4.0 mg mL−1.
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