Cas No: 147128-77-6, (4R,6S)-4-hydroxy-6-methyl-5,6-dihydro-4h-thieno[2,3-B] thhiopyran-7,7-dioxide (chiral sulfone) is a chemical compound used in the production of dorzolamide, which is used to lower excessive intraocular pressure in open-angle glaucoma and ocular hypertension. This drug can cross the cornea, reach the ciliary body of the eye, and produce systemic effects on the carbonic anhydrase enzyme within the eye.