(A) Chemical structure MI-63. (B) Chemical structure RITA. Granta-519 (C, E, G) and H929 (D, F, H) wild type (WT) cells, along with their MI-63-resistant (MI63R) and Nutlin-resistant (NutlinR) counterparts, were treated for 72-hours with MI-63, Nutlin or RITA. Cell viability was determined using the WST-1 reagent, and results were expressed as the percentage viability relative to vehicle controls, which were arbitrarily set at 100%. IC50 values for MI-63, Nutlin and RITA-exposed conditions were determined, and fold changes in the IC50 were calculated relative to WT cells (Supplementary Table 1).