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Growth curves of Escherichia coli: Filled square control, Filled circle 2′,3-dihydroxychalcone (I), Filled up pointing triangle 2′,3-dihydroxychalcone (I)–nalidixic acid (2 μg/mL), Filled diamond 2′,3-dihydroxychalcone–nalidixic acid (2 μg/mL)–rutin (20 μg/mL)
