Bazedoxifene-d 4 (acetate) is the deuterium labeled Bazedoxifene. Bazedoxifene (TSE-424) is an oral, BBB-penetrant nonsteroidal selective estrogen receptor modulator (SERM), with IC50s of 23 nM and 99 nM for ERα and ERβ , respectively. Bazedoxifene can be used for the research of osteoporosis. Bazedoxifene also acts as an inhibitor of IL-6/GP130 protein-protein interactions and can be used for the research of pancreatic cancer.