6-Chlorooxazolo[4,5-b]pyridin-2(3H)-one (CAS No.35570-68-4), its synonyms are 6-Chloro[1,3]oxazolo[4,5-b]pyridin-2(3H)-one ; Oxazolo[4,5-b]pyridin-2(3H)-one, 6-chloro- .