Lasofoxifene (Pfizer).

Pfizer is developing lasofoxifene, an oral naphthalene derivative selective estrogen receptor modulator identified under a collaboration with Ligand, for the treatment of osteoporosis and vaginal atrophy. In August 2004, Pfizer submitted a New Drug Application to the Food and Drug Administration (FDA) seeking approval of lasofoxifene for the treatment of osteoporosis; however, in September 2005, the FDA issued a non-approvable letter.