Patent ID: 7781459

Claim:
A compound of the formula I, in which R1 is H, (C 1 -C 6 )-alkyl or (C 0 -C 6 )-alkyl-phenyl wherein the phenyl ring is optionally mono- or disubstituted with F, Cl, Br, CN, OH, (C 1 -C 6 )-alkyl, O—(C 1 -C 6 )-alkyl, CF 3 , OCF 3 , COOH, COO(C 1 -C 6 )-alkyl or CONH 2 ; R2 is H, (C 1 -C 6 )-alkyl, O—(C 1 -C 6 )-alkyl, CO—(C 1 -C 6 )-alkyl, COO—(C1-C 6 )-alkyl or (C 0- C 6 )-alkylene-COOH; R3 is H, F, Cl, Br, OH, CF 3 , NO 2 , CN, OCF 3 , O—(C 1 -C 6 )-alkyl or (C1-C 6 )-alkyl; and n is 1, 2, 3, 4, 5, 6, 7 or 8; and pharmaceutically acceptable salts thereof.