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(A) Superimposition of the docked structures of the active compounds 4b, 5b–c, 6a–b, 7a–c, 10 and 11, together with the chemotherapeutic substrate doxorubicin and tariquidar. (B) The same for poor or inactive compounds 2, 2b–c, 3a–c, 5, 8, 8a, 9 and 9a.
