ML230 (CID44640177; SID 88095709) is a selective inhibitor of ATP-binding cassette (ABC) transporter ABCG2, and 36-fold selective for ABCG2 over ABCB1 with EC50s values of 0.13 μM and 4.65 μM, respectively[1]. EC50: ABCG2 (0.13 μM)[1]
[1]. Strouse JJ, et al. Selective Efflux Inhibition of ATP-binding Cassette Sub-family G Member 2. Probe Reports from the NIH Molecular Libraries Program. November 30, 2010.