Cyclofenil Diphenol and its Impurities

Cyclofenil Diphenol is a synthetic nonsteroidal estrogen belonging to the triphenylethylene group. It was historically used as a selective estrogen receptor modulator (SERM). Reference standards of Cyclofenil Diphenol API, and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.