OCULAR HYPOTENSIVE AGENT

摘要

This invention relates to an ocular hypotensive agent which comprises a compound represented by the formula: <IMG> wherein R1 represents hydrogen or an optionally substituted hydrocarbon residue that may be bound via a hetero atom; R2 represents hydrogen or a hydrocarbon residue that may have a substituent; R3 represents a group capable of forming an anion or a group capable of changing thereto; X is a covalent bond between the 2 benzene rings or a spacer having a chain length of 1 to 2 atoms as the linear moiety between the adjoining phenylene group and phenyl group; n represents 1 or 2; ring A is a benzene ring having 1 or 2 optional substituents in addition to the group represented by COOR2, or a pharmaceutically acceptable salt thereof.