ONT-093 CAS NO.216227-54-2

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ONT-093 (formerly OC-144-093) is an orally bioavailable P-glycoprotein pump inhibitor, for the potential reversal of multidrug resistance in patients undergoing cancer chemotherapy. ONT-093 could inhibit P-gp and reverse multidrug resistance at nM concentrations with no effect on paclitaxel pharmacokinetics. Phase I trials of ONT-093 in normal human volunteers showed no dose-limiting toxicities at serum concentrations associated with biologic activity achieved with doses ranging from 300 to 500 mg.