摘要 |
This invention provides estrogen receptor modulators of formula I, having the structure wherein R<SUB>1</SUB>, R<SUB>2</SUB>, R<SUB>2a</SUB>, R<SUB>3</SUB>, R<SUB>3a</SUB>, and R<SUB>4</SUB>, and X as defined in the specification, or a pharmaceutically acceptable salt thereof.
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