Spiroxasone
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| Routes of administration | By mouth | 
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| Formula | C24H34O3S | 
| Molar mass | 402.59 g·mol−1 | 
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Spiroxasone (INN, USAN) is a synthetic, steroidal antimineralocorticoid of the spirolactone group which was developed as a diuretic and antihypertensive agent but was never marketed. It was synthesized and assayed in 1963. The drug is 7α-acetylthiospirolactone with the ketone group removed from the C17α spirolactone ring. Similarly to other spirolactones like spironolactone, spiroxasone also possesses antiandrogen activity.