Progesterone (left) and its derivative, alfaxolan (right); the differences are highlighted in pink.<unk> , also known as 11-oxo-3α,5α-tetrahydroprogesterone, 5α-pregnan-3α-ol-11,20-dione, or 3α-hydroxy-5α-pregnane-11,20-dione, is a synthetic pregnane steroid and a derivative of progesterone. It is specifically a modification of progesterone in which the C3 ketone has been reduced to a hydroxyl group, the double bond between the C4 and C5 positions has been reduced and is now a single bond, and a ketone has been substituted at the C11 position.<unk>  is also a derivative of allopregnanolone, differing from it only by the addition of the C11 ketone. Other closely related steroids include ganaxolone, hydroxydione, minaxolone, pregnanolone, and renanolone.
Alfaxalone
Metaxalone
Guaifenesin
Bethanechol
Butalbital
Benzoctamine
Pseudoephedrine
Ephedrine