Abstract
SUMMARY: The α-ketolic steroid R6, previously described by de Courcy, Bush, Gray & Lunnon [1953], has been identified as tetrahydrocorticosterone. The structures of X6 and some other αβ-unsaturated ketones appearing on chromatograms of urine extracts and giving the Bush soda fluorescence reaction are discussed. Four of these compounds are of exogenous origin and follow the ingestion of citrus fruits.