Patent ID: 8258168

Claim:
A compound of formula (Va): in which X 1 , X 2 , X 3 and X 4 each represent, independently of one another, a hydrogen or halogen atom or a cyano, C 1 -C 6 -alkyl, C 1 -C 6 -fluoroalkyl, C 1 -C 6 -alkoxy or C 1 -C 6 -fluoroalkoxy group; and Y represents a C 1 -C 6 -alkyl, C 1 -C 6 -fluoroalkyl, aryl or heteroaryl group; and wherein the aryl or heteroaryl groups optionally being substituted by one or more atoms or groups selected from halogen atoms, and C 1 -C 6 -alkyl, C 1 -C 6 -alkoxy, C 1 -C 6 -alkylthio, C 1 -C 6 -alkyl-S(O)—, C 1 -C 6 -alkyl-S(O) 2 — and C 1 -C 6 -fluoroalkyl groups.