for the following products
(4-trans)-N-[2-(Aminosulfonyl)-5,6-dihydro-6-methyl-7,7-dioxido-4H-thieno-[2,3-b]thiopyran-4-yl]-Acetamide | (4S)-4-Acetamide-5,6-dihydro-6-methyl-2-sulfonamide-thio[2,3-b]thiopyran-7,7dioxide | Dorzolamide impurity 3 | N-[(4S,6S)-6-methyl-7,7-dioxo-2-sulfamoyl-5,6-dihydro-4H-thieno[2,3-b]thiopyran-4-yl]acetamide and N-(6-methyl-7,7-dioxo-2-sulfamoyl-4,5,6,7-tetrahydro-7|6-thieno[2,3-b]thiopyran-4-yl)-acetamide
