Estrazinol (INN; also known as estrazinol hydrobromide (USAN), 3-methoxy-8-aza-19-norpregna-1,3,5(10)-trien-20-yn-17-ol, or development code W-4454A) is a synthetic, steroidal estrogen that was synthesized in 1968 and further characterized in 1973 but was never marketed.
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