4-[4-[2-(cyclopropylmethoxy)-5-methylsulfonylbenzoyl]piperazin-1-yl]-3-fluorobenzonitrile 4-[4-[2-(cyclopropylmethoxy)-5-methylsulfonyl-benzoyl]piperazin-1-yl]-3-fluoro-benzonitrile 4-[4-[[2-(cyclopropylmethoxy)-5-methylsulfonylphenyl]-oxomethyl]-1-piperazinyl]-3-fluorobenzonitrile 4-[4-[2-(cyclopropylmethoxy)-5-mesyl-benzoyl]piperazin-1-yl]-3-fluoro-benzonitrile 4-[4-[2-(cyclopropylmethoxy)-5-methylsulfonyl-phenyl]carbonylpiperazin-1-yl]-3-fluoro-benzonitrile