title: Analysis of steroids. XVII. A differential spectrophotometric variant of the diethyl oxalate method for the determination of ketosteroid contaminants.
mesh_terms: D007664:Ketosteroids / Q000032:analysis; D008722:Methods; D010070:Oxalates; D013053:Spectrophotometry; D013256:Steroids / Q000032:analysis*
chemical_list: D007664:Ketosteroids; D010070:Oxalates; D013256:Steroids