Patent ID: 8835646

Claim:
A compound of formula (II) wherein R is selected from the group consisting of: hydrogen, (C 1 -C 7 ) alkyl, and (C 2 -C 7 ) alkenyl; R 1 is selected from F, Cl, Br, I and H 2 N—; R 2 , R 3 , R 4 , and R 5 are selected independently from the group consisting of: hydrogen, (C 2 -C 7 ) alkenyl, (C 1 -C 7 ) alkyl, (C 3 -C 8 ) cycloalkyl, F, Cl, Br, I, cyano, nitro, H 2 N—, (C 1 -C 7 ) haloalkyl, and (C 1 -C 7 ) alkoxy; R 6 and R 7 are hydrogen; or a pharmaceutically acceptable salt thereof; or an optical isomer thereof; or a mixture of optical isomers.