Synonyms: Benzenesulfonamide, 2-chloro-5-(2,3-dihydro-3-oxo-1H-isoindol-1-yl)-, 2-Chloro-5-(2,3-dihydro-3-oxo-1H-isoindol-1-yl)benzenesulfonamide, 2-Chloro-5-[(1RS)-3-oxo-2,3-dihydro-1H-isoindol-1-yl]benzenesulfonamide, 3-Dehydroxy Chlorthalidone, Chlortalidone Imp. E (EP)