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The optical micrographs of the wet gel samples formed by several ureas. a) Compound 19 in DMSO/H2O (1:2) at 2.0 mg/mL; b) compound 17 in EtOH/H2O (1:2) at 3.3 mg/mL; c) and d) a gel formed by compound 21 in EtOH/H2O (1:2) at 5.0 mg/mL; e) and f) are from the gel formed by compound 22 in DMSO/H2O (1:2) at 4.0 mg/mL.
