NSC9159 Pregna-1,4-diene-3,20-dione, 11.beta.,17,21-trihydroxy-, 21-(hydrogen 3,3-dimethylglutarate) Pregna-1,4-diene-3,20-dione, 21-(4-carboxy-3,3-dimethyl-1-oxobutoxy)-11,17-dihydroxy-, (11.beta.)-