MW 355.7 Da, Purity >98%. Highly selective multidrug resistance protein 4 (MRP4) inhibitor (IC50 = 7 µM). Blocked transport of MRP4 substrates, including 6-Mercaptopurine, SN 38, D-Luciferin and E217βG. No detectable effect on MRP4 homologs MRP1, 2, 3 or 5, and related transporters P-gp and ABCG2 *in vitro*. Low cellular toxicity, and high microsomal and acid stability. Chemically distinctive to Ceefourin™ 1 (ab145144).
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