The byiithe& atid adrenal-inhibitory effects of a series of substituted 2, 2-diphenethylamines are described. Nost of the analogs appear to suppress adrenal steroidogenesis by inhibition of the 11-hydroxylation reaction. The introduction of methyl at C-2 of the aliphatic side chain of 2 appears to inhibit enzymatic reactions occurring early in the biobyiithetic pathway, while the introduction of methyl at C-1 of 1 is followed by a highly selective inhibition of ...