abstract |
The present invention relates to 5,6-dihydro-4- (S)-of formula (I), commonly known as dorzolamide hydrochloride, which is useful as an agent for lowering intraocular pressure by inhibiting carbonic anhydrase enzyme. An improved process for the preparation of (ethylamino) -6- (s) methyl-4H-thieno [2,3bi] thiopyran-2-sulfonamide-7,7-dioxide hydrochloride is disclosed. |