sodium 4-{2-[(4aS,5S,6aS,6bS,9aS)-4b-fluoro-5-hydroxy-4a,6a,8,8-tetramethyl-2-oxo-2,4a,4b,5,6,6a,9a,10,10a,10b,11,12-dodecahydro-6bH-naphtho[2',1':4,5]indeno[1,2-d][1,3]dioxol-6b-yl]-2-oxoethoxy}-4-oxobutanoate