Details on the preparation and spectroscopic characterization of NB compounds were previously described [29 (link)]. NB-73, NB-115, Thiostrepton (Sigma-Aldrich #598226), FDI-6 (Sigma-Aldrich #SML1392), RCM-1 (R&D Systems, Minneapolis, MN, USA, #6845), N-phenylphenanthren-9-amine (Sigma-Aldrich, St. Louis, MO, USA, #761966), MG132 (Sigma-Aldrich #474790), Q-VD-OPh (R&D Systems #OPH001), and olaparib (Selleck Chemicals, Houston, TX, USA, #S1060) were dissolved in DMSO. NB-55 and monensin (R&D Systems #5223) were dissolved in ethanol. Carboplatin (Sigma-Aldrich #C2538) was dissolved in water. All compounds were stored at -20 °C.
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