Synonyms: INTERMEDIATE FOR DORZOLAMIDE;5,6-DIHYDRO-4H-4-HYDROXY-6-METHYL THIENO [2,3,B] THIOPYRAN-2-SULFONAMIDE-7,7-DIOXIDE;5,6-DIHYDRO-4-HYDROXY-6-METHYL-4H-THIENO[2,3-B]THIOPYRAN-2-SULFONAMIDE 7,7-DIOXIDE;4H-Thieno[2,3-b]thiopyran-2-sulfonamide,;4H-Thieno[2,3-b]thiopyran-2-sulfonamide,5,6-dihydro-4-hydroxy-6-methyl-, 7,7-dioxide;Dorzolamide intermediate