Fig. 1.
Chemical structures of BQAs. Substitutions at the 19-position (R) include phenyl (Ph), 4-phenyl-phenyl (Ph-Ph), naphthyl, 4-methoxy-phenyl (Ph-OMe), 4-morpholinyl-phenyl (Ph-Mor), hydroxymethyl (HM), dimethylamino (DMA), and methyl (Me).
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