2-Sulfobenzoic acid cyclic anhydride 2-Sulphobenzoic anhydride 27396-44-7 3H-2,1-Benzoxathiol-3-one, 1,1-dioxide 4377-89-3 81-08-3 Benzoic acid, 2-sulfo-, cyclic anhydride Benzoic acid, o-sulfo-, cyclic anhydride (8CI) EINECS 201-322-6 NSC 11208 Sulfobenzoic anhydride o-Sulfobenzoic acid anhydride o-Sulfobenzoic acid, cyclic anhydride