Figure 1.
Chemical structure of 1: coumarin; 2: 7-hydroxycoumarin: 3: 7,8-diacetoxy-4-methylcoumarin (DAMC); 4: 4-(7-diethylamino)-4-methyl-2-oxo-2H-chromen-3-yl)-phenylacetate: 5: 3-(4-(2-(dimethylamino)ethoxy)phenyl)-7-methoxy-4-phenylcoumarin.
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