Elacestrant and its Impurities

Elacestrant, sold under the brand name Orserdu, is an anticancer medication. it is an estrogen receptor antagonist used to treat ER-positive, HER2-negative, ESR1-mutated advanced or metastatic breast cancer with disease progression following at least one line of endocrine therapy. Reference standards of Elacestrant API, and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.