MK-571 is a selective, orally active?antagonist of the CysLT1 receptor. MK571 is a multidrug resistance protein-2 (ABCC2, Mrp2) inhibitor used to demonstrate the role of Mrp2 in the cellular efflux of drugs, xenobiotics, and their conjugates. MK571 can inhibit the synthesis of K-4′-O-GlcA (19.7 μM). MK571 dose-dependently inhibits the intracellular biosynthesis of all flavonol sulphates and glucuronides by Caco-2 cells. MK571 significantly inhibits phase-2 conjugation of kaempferol by cell-free extracts of Caco-2, and production of kaempferol-4′-O-glucuronide was competitively inhibited. In addition to inhibiting MRP2,  MK571 is a potent inhibitor of enterocyte phase-2 conjugation.

MK-571钠盐用途：

MK-571 sodium salt是一种选择性，口服活性的白三烯D4受体拮抗剂，在豚鼠和人肺膜的Ki分别为0.22 和 2.1 nM。