Patent ID: 8778949

Claim:
A compound of formula I: where: a is 0, 1, or 2; each R 1 is independently halo or trifluoromethyl; R 2 is hydrogen, halo, —C 1-6 alkyl, —O—C 1-6 alkyl, —C 0-1 alkylene-phenyl, —O—C 0-3 alkylene-phenyl, or —CN; R 3 is hydrogen, halo, —C 1-6 alkyl, or —O—C 1-6 alkyl; R 4 is hydrogen, halo, or —C 1-6 alkyl; R 5 is hydrogen or halo; and R 6 is hydrogen, halo, or —C 1-6 alkyl; or a pharmaceutically acceptable salt thereof; with the proviso that the compound of formula I is not 1-(2-phenoxymethylphenyl)piperazine, 1-[2-(3-fluorophenoxymethyl)phenyl]piperazine, or 1-[2-(2,3-difluorophenoxymethyl)phenyl]-piperazine.