Estradiol 3-glucuronide is an estrogen metabolite, which is a glucuronide conjugate formed from Estradiol (HY-B0141) via catalysis by uridine diphosphate glucuronosyltransferases in tissues such as the liver. Estradiol 3-glucuronide is a potent substrate of Mrp2, with an S50 value of 55.7 µM. Estradiol 3-glucuronide achieves hepatobiliary transport in hepatocytes through basolateral uptake via OATP1B1, OATP1B3 and OATP2B1, as well as apical efflux via MRP2 and BCRP[1][2][3].