The subject invention provides deuterated N-ethyl-N-phenyl-1,2-dihydro-4-hydroxy-5- chloro-1-methyl-2-oxoquinoline-3-carboxamide, its salts and uses.La invención actual proporciona N-etil-N-fenil-1,2-dihidro-4-hidro xi-5-cloro-1-metil-2-oxoquinolina-3-carboxamida deuterada, sus sales y usos.