high-performance liquid chromatographic assay for the simultaneous measurement of two spironolactone analogues , 17 beta-hydroxy-3-oxo-17-pregn-4-ene-21-carboxylic acid-gamma-lactone 7 alpha-methyl ethyl ester and its 6 beta-hydroxylated derivative .
C0037982
spironolactone
C0022947
lactone