The present invention provides a compound represented by formula (I) or a salt thereof. (In formula (I), R1 is an (un)substituted C1-6 alkyl group, R2 is a hydrogen atom, etc., R3 is an (un)substituted C1-6 alkoxycarbonyl group, etc., R4 and R4' are each a hydrogen atom, etc., Z is an oxygen atom, R5 is an (un)substituted C1-6 alkyl group, etc., X is a halogeno radical, etc., and n is an integer of 0-5.)
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