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Novel furoxan-based nitric oxide (NO)-releasing DDB derivatives (7a–j) were synthesized. Compounds 7i and 7j significantly reversed the resistance of MCF-7/Adr cells to doxorubicin in the combination treatment, and markedly increased the intracellular accumulation of doxorubicin probably via inhibiting Pgp-mediated intracellular drug efflux as well as down-regulating doxorubicin-induced Pgp expression...
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