Not Less Than - 95%
(5α,17β)-N-(1,1-Dimethylethyl)-3-oxo-4-azaandrost-1-ene-17-carboxamide; 4-Azaandrost-1-ene-17-carboxamide, N-(1,1-dimethylethyl)-3-oxo-, (5α,17β)-; N-tert-Butyl-3-oxo-4-aza-5α-androst-1-ene-17β-carboxamide