5-[5-[3-fluoro-4-(methylcarbamoyl)phenyl]-8-oxo-6-sulfanylidene-5,7-diazaspiro[3.4]octan-7-yl]-3-(trifluoromethyl)pyridine-2-carboxamide; 5-(5-(3-Fluoro-4-(methylcarbamoyl)phenyl)-8-oxo-6-thioxo-5,7-diazaspiro[3.4]octan-7-yl)-3-(trifluoromethyl)picolinamide