2-Oxo-2,3-dihydrobenzooxazole-6-sulfonyl chloride (CAS NO.27685-90-1), its Synonyms are 2,3-Dihydro-2-oxobenzoxazole-6-sulphonyl chloride ; 6-Benzoxazolesulfonyl chloride, 2,3-dihydro-2-oxo- ; Benzoxazalone, 6-sulfochloride .