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. 2020 Sep 21;25(18):4321. doi: 10.3390/molecules25184321

Figure 6.

Figure 6

Chemical structures of some indole-based 8-hydroxyquinoline derivatives. Reagents: (a) acetic anhydride, 2-nitrobenzaldehydes; (b) 1,10-phenathroline·H2O, Pd(OAc)2, CO; (c) K2CO3 or NaOCH3.