Patent ID: 7439382

Claim:
A compound of formula (1): wherein R 1 represents t-butyl; R 2 represents a halogen atom, straight chain or branched chain C1-C8 alkyl optionally substituted by a halogen atom; nitro, ester having 1 to 4 carbon atoms, C1-C4 alkyl, C1-C4 alkoxy, allyl, nitrophenyl, or C1-C4 alkylsulfonyl; or C3-C8 cycloakly optionally substituted by a halogen atom, nitro, ester having 1 to 4 carbon atoms, C1-C4 alkyl, C1-C4 alkoxy, allyl, nitrophenyl, or C1-C4 alkylsulfony; R 3 represents methyl; n is zero; and X represents a fluorine atom.