β-Estradiol-d3 3-(β-D-Glucuronide) 17-Sulfate Dipotassium Salt is the labeled analogue of β-Estradiol 3-(β-D-Glucuronide) 17-Sulfate Dipotassium Salt (E888090), a salt analogue of the free acid β-Estradiol 3-(β-D-Glucuronide) 17-Sulfate, formed in vitro by human mammary cancer cells.