5-Chloro-1,3-dihydro-2H-pyrrolo[3,2-beta]pyridin-2-one (CAS NO.136888-08-9), its Synonyms are 2H-pyrrolo[3,2-beta]pyridin-2-one, 5-chloro-1,3-dihydro- ; 1H-Pyrrolo[3,2-beta]pyridin-2(3H)-one .