Patent ID: 6423691
Filing Date: 2002-07-23
Classification: A61K,A61P

Abstract:
A method for the prophylaxis or treatment of a disease arising from ocular fundus tissue cytopathy, which comprises administering an effective amount of a compound of the formula (I) wherein R1 represents an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 10 carbon atoms which is optionally substituted; R2 and R3 may be the same or different and each represents hydrogen or an alkyl group having 1 to 4 carbon atoms or R2 and R3 may jointly form a ring having 3 to 7 carbon atoms; and R4 represents a lower alkyl group which is optionally substituted by aryl, cycloalkyl, or aromatic heterocyclic residue, or a pharmaceutically acceptable salt thereof.