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Estriol phosphate , or estriol 17β-phosphate, also known as estra-1,3,5-triene-3,16α,17β-triol 17β-, is an estrogen which was never marketed. It is an estrogen ester, specifically an ester of estriol with phosphoric acid, and acts as a prodrug of estriol by cleavage via phosphatase enzymes in the body. Estriol phosphate is contained within the chemical structure of polyestriol phosphate , and this medication has been marketed for medical use.
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