Synonyms: Spirolactone;20-Spirox-4-ene-3,20-dione;3-(3-Oxo-17-beta-hydroxy-4-androsten-17-alpha-yl)propionic acid gamma-lactone;4-17-00-06330 (Beilstein Handbook Reference);BRN 0043765;SC 5233;omega-(3-Oxo-17-beta-hydroxy-4-androsten-17-alpha-yl) propionic acid lactone;17-alpha-Pregn-4-ene-21-carboxylic acid, 17-hydroxy-3-oxo-, gamma-lactone;3-Oxopregn-4-ene-21,17alpha-carbolactone;(8R,9S,10R,13S,14S,17R)-10,13-dimethyl-1,6,7,8,9,10,11,12,13,14,15,16-dodecahydro-3'H-spiro[cyclopenta[a]phenanthrene-17,2'-furan]-3,5'(2H,4'H)-dione