Patent ID: 6849647

Claim:
Compounds represented by the formula (I) wherein represents an optionally substituted divalent residue of benzene, cyclohexane or naphthalene, or a group: Het represents a 2,4-disubstituted-6-alkyl-pyridin-3-yl, wherein each substituent is a lower alkyloxy group having between 1 and 6 carbon atoms or a lower alkylthio group having between 1 and 6 carbon atoms; X represents an oxygen atom; Y represents —NR 4 —, an oxygen atom, a sulfur atom, a sulfoxide or a sulfone; Z represents a single bond; R 4 represents a hydrogen atom, a lower alkyl group, an aryl group or an optionally substituted silyl lower alkyl group; and n is an integer of from 2 to 15, or salts or solvates thereof.