abstract |
In the present invention, a compound of the formula (I) wherein R 1 is a substituted or unsubstituted C1-6 alkyl group, R 2 is a hydrogen atom or the like, and R 3 is a substituted or unsubstituted C 1 to 6 alkoxycarbonyl group etc., R 4 and R 4 ′ are a hydrogen atom etc., Z is an oxygen atom, R 5 is a substituted or unsubstituted C 1-6 alkyl group etc., and X is And a halogeno group etc., wherein n is an integer of 0 to 5) or a salt thereof. |