17|A-Carboxy-17-desoxy Dexamethasone

(8S,9R,10S,11S,13S,14S,16R,17R)-9-fluoro-11-hydroxy-10,13,16-trimethyl-3-oxo-7,8,11,12,14,15,16,17-octahydro-6H-cyclopenta[a]phenanthrene-17-carboxylic acid