4-[4-[(S)-(4-chlorophenyl)-pyridin-2-ylmethoxy]piperidin-1-yl]butanoic acid 4-[4-[(S)-(4-chlorophenyl)-(2-pyridyl)methoxy]-1-piperidyl]butanoic acid 4-[4-[(S)-(4-chlorophenyl)-(2-pyridyl)methoxy]-1-piperidinyl]butanoic acid 4-[4-[(S)-(4-chlorophenyl)-(2-pyridyl)methoxy]-1-piperidyl]butyric acid 4-[4-[(S)-(4-chlorophenyl)-pyridin-2-yl-methoxy]piperidin-1-yl]butanoic acid