The present invention relates to indole derivatives represented by the general formula:
 wherein R represents an ethyl group or a 2,2,2-trifluoroethyl group; Y represents a hydroxy group or a pivaloyloxy group; and the carbon atom marked with (R) represents a carbon atom in (R) configuration, and pharmaceutically acceptable salts thereof, which have potent and prolonged reducing effects on intraocular pressure and are useful as agents for lowering intraocular pressure.
                            本发明涉及通式所代表的
吲哚衍
生物:
 其中 R 代表乙基或 
2,2,2-三氟乙基;Y 代表羟基或新戊酰氧基;标有 (R) 的碳原子代表 (R) 构型的碳原子,以及它们的药学上可接受的盐类,这些衍
生物对眼压具有强效和持久的降低作用,可用作降低眼压的药物。