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Stability test results under acidic conditions. a) A gel formed by compound 23 in DMSO/H2O (1:2) at 5 mg/mL. b) A gel formed by compound 21 in DMSO/H2O (1:2) at 5 mg/mL. The photos show the gels treated with 1 mL of sulfuric acid solution (pH 1) at different time periods.
