4-[7-[6-cyano-5-(trifluoromethyl)-3-pyridinyl]-6,8-dioxo-5,7-diazaspiro[3.4]octan-5-yl]-2-fluoro-N-methylbenzamide; 4-(7-(6-Cyano-5-(trifluoromethyl)pyridin-3-yl)-6,8-dioxo-5,7-diazaspiro[3.4]octan-5-yl)-2-fluoro-N-methylbenzamide; Apalutamide Dioxo Impurity; Apalutamide Di keto impurity; 4-[7-[6-Cyano-5-(trifluoromethyl)-3-pyridinyl]-6,8-dioxo-5,7-diazaspiro[3.4]oct-5-yl]-2-fluoro-N-methylbenzamide