N-(4-Cyano-3-(trifluoromethyl)phenyl)-2-((4-fluorophenyl)sulfonyl)-3-hydroxy-2-methylpropanamide-d4 is the isotope labelled analog of N-(4-Cyano-3-(trifluoromethyl)phenyl)-2-((4-fluorophenyl)sulfonyl)-3-hydroxy-2-methylpropanamide (C987435); an impurity of Bicalutamide (B382000) which is a non-steroidal peripherally active antiandrogen. Also used as an antineoplastic (hormonal).