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Optical images of (A) gel IV (1.5 wt %, pH = 4.6), (B) gel IV after UV irradiation (no aging), (C) gel IV after UV irradiation (aging 2 hours), (D) the structure of compound 6 in trans- and cis-isomers, (E) the NMR spectra of compound 6 before and (F) after UV irradiation for 2 hours.
