.beta.-Methasonephosphate 151-73-5 AIDS-073148 AIDS073148 Betnesol Celestone phosphate Linolosal Linosal NSC90616 Pregna-1,4-diene-3,20-dione, 9-fluoro-11,17-dihydroxy-16-methyl-21-(phosphonooxy)-,disodium salt, (11.beta.,16.beta.)-