1,3-dihydro-2,1lambda~6~-benzoxathiole-1,1,3-trioneSBAAo-SULFOBENZOIC ACID cyclic-ANHYDRIDE2,1-Benzoxathiol-3-one-1,1-dioxide2-Sulfobenzoic acid cyclic anhydride2-Sulfobenzoic acid cyclic anhydride3H-Benzo[c][1,2]oxathiol-3-one 1,1-dioxide2-磺酸苯甲酸酐2-Sulfobenzoic anhydride2-Sulfobenzoic anhydride