1-[2-[4-(Chloromethyl)phenoxy]ethyl]hexahydro-1H-azepine-d4 Hydrochloride is an intermediate in the synthesis of Bazedoxifene-d4 (B129247). Bazedoxifene-d4 is a labeled nonsteroidal selective estrogen receptor modulator (SERM). Bazedoxifene is used as an antiosteoporotic.