| abstract |
(57) [Summary] [Object] The present invention provides a novel prostaglandin derivative and an intraocular pressure-lowering agent having a strong intraocular pressure-lowering action. ## STR1 ## Formula (I): (In the formula, R 1 is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, R 2 is a cycloalkyl group having 4 to 8 carbon atoms, a cycloalkylmethyl group having 5 to 9 carbon atoms or a carbon atom. A prostaglandin derivative represented by a cycloalkyl group having 5 to 7 carbon atoms substituted by an alkyl group having 1 to 4 and n is 0 or 1, and a salt thereof, and the derivative Alternatively, an intraocular pressure-lowering agent containing a salt thereof as an active ingredient. |