17-alpha-Pregn-4-ene-21-carboxylic acid, 17-hydroxy-3-oxo-, gamma-lactone 20-Spirox-4-ene-3,20-dione 3-(3-Oxo-17-beta-hydroxy-4-androsten-17-alpha-yl)propionic acid gamma-lactone 3-Oxopregn-4-ene-21,17alpha-carbolactone 4-17-00-06330 (Beilstein Handbook Reference) 976-70-5 BRN 0043765 EINECS 213-552-4 SC 5233 Spirolactone omega-(3-Oxo-17-beta-hydroxy-4-androsten-17-alpha-yl) propionic acid lactone