Abstract: A pharmaceutical composition is provided for prophylaxis and treatment of a retinal disease in a human comprising (a) a compound of the formula I: ##STR1## wherein R.sub.1 and R.sub.2 independently from each other denote hydrogen or methyl group, or a pharmacologically acceptable salt thereof, and (b) a pharmacologically acceptable carrier therefor. Also provided are a method for prophylaxis and treatment of a retinal disease comprising administering such a compound and a use of such a compound for preparing a pharmaceutical composition for the same purpose.

Abstract: Presented are an oxidized-type glutathione alkyl ester represented by the formula (I). ##STR1## wherein R denotes a lower alkyl group, and a salt thereof: a method of preparing said ester which is comprised of oxidizing a reduced-type glutathione monoalkyl ester represented by the formula (II), ##STR2## wherein R is as defined above, with the air, hydrogen peroxide or iodine in an aqueous solution: and a pharmaceutical composition and method for suppression of hepatic disorders characterized in that it contains as an active constituent said ester or a pharmaceutically acceptable salt thereof.