A compound represented by the formula: wherein Het is an optionally substituted heterocyclic group, n is 0 or 1, R 1 and R 2 are the same or different and each is a hydrogen atom, a C 1-6 alkyl group or a halogen atom, R 3 is an optionally substituted hydroxy group or an optionally substituted amino group, R 4 is a hydrogen atom, an optionally substituted hydrocarbon group, an optionally substituted hydroxy group or an optionally substituted amino group, R 5 and R 6 are the same or different and each is a hydrogen atom, a C 1-6 alkyl group or a halogen atom, and R 7 and R 8 are the same or different and each is a hydrogen atom, a C 1-6 alkyl group, a halogen atom or an optionally substituted hydroxy group, or a salt thereof (except 4-[[3-(2-pyrazinyl)phenyl]methoxy]benzenepropanoic acid, methyl 4-[[3-(2-pyrazinyl)phenyl]methoxy]benzenepropanoate, methyl 4-[[3-[5-(trifluoromethyl)-2-pyridinyl]phenyl]methoxy]benzenepropanoate, 4-[[3-[5-(trifluoromethyl)-2-pyridinyl]phenyl]methoxy]benzenepropanoic acid, 4-[[3-(2-thiazolyl)phenyl]methoxy]benzenepropanoic acid, methyl 4-[[3-(2-thiazolyl)phenyl]methoxy]benzenepropanoate, 4-[[3-(1H-pyrrol-1-yl)phenyl]methoxy]benzenepropanoic acid, methyl 4-[[3-(1H-pyrrol-1-yl)phenyl]methoxy]benzenepropanoate, 4-[[3-(3-furyl)phenyl]methoxy]benzenepropanoic acid, methyl 4-[[3-(3-furyl)phenyl]methoxy]benzenepropanoate, 4-[[3-(5-pyrimidinyl)phenyl]methoxy]benzenepropanoic acid, 4-[[3-(2-pyridinyl)phenyl]methoxy]benzenepropanoic acid, methyl 4-[[3-(2-pyridinyl)phenyl]methoxy]benzenepropanoate, 4-[[3-(2-pyrimidinyl)phenyl]methoxy]benzenepropanoic acid, methyl 4-[[3-(2-pyrimidinyl)phenyl]methoxy]benzenepropanoate, 4-[[3-(2-thienyl)phenyl]methoxy]benzenepropanoic acid, methyl 4-[[3-(2-thienyl)phenyl]methoxy]benzenepropanoate, 4-[[3-(2-thienyl)phenyl]methoxy]benzenepropanoic acid and methyl 4-[[3-(2-thienyl)phenyl]methoxy]benzenepropanoate). n is 0 or 1, R 1 and R 2 are the same or different and each is a hydrogen atom, a C 1-6 alkyl group or a halogen atom, R 3 is an optionally substituted hydroxy group or an optionally substituted amino group, R 4 is a hydrogen atom, an optionally substituted hydrocarbon group, an optionally substituted hydroxy group or an optionally substituted amino group, R 5 and R 6 are the same or different and each is a hydrogen atom, a C 1-6 alkyl group or a halogen atom, and R 7 and R 8 are the same or different and each is a hydrogen atom, a C 1-6 alkyl group, a halogen atom or an optionally substituted hydroxy group, or a salt thereof (except 4-[[3-(2-pyrazinyl)phenyl]methoxy]benzenepropanoic acid, methyl 4-[[3-(2-pyrazinyl)phenyl]methoxy]benzenepropanoate, methyl 4-[[3-[5-(trifluoromethyl)-2-pyridinyl]phenyl]methoxy]benzenepropanoate, 4-[[3-[5-(trifluoromethyl)-2-pyridinyl]phenyl]methoxy]benzenepropanoic acid, 4-[[3-(2-thiazolyl)phenyl]methoxy]benzenepropanoic acid, methyl 4-[[3-(2-thiazolyl)phenyl]methoxy]benzenepropanoate, 4-[[3-(1H-pyrrol-1-yl)phenyl]methoxy]benzenepropanoic acid, methyl 4-[[3-(1H-pyrrol-1-yl)phenyl]methoxy]benzenepropanoate, 4-[[3-(3-furyl)phenyl]methoxy]benzenepropanoic acid, methyl 4-[[3-(3-furyl)phenyl]methoxy]benzenepropanoate, 4-[[3-(5-pyrimidinyl)phenyl]methoxy]benzenepropanoic acid, 4-[[3-(2-pyridinyl)phenyl]methoxy]benzenepropanoic acid, methyl 4-[[3-(2-pyridinyl)phenyl]methoxy]benzenepropanoate, 4-[[3-(2-pyrimidinyl)phenyl]methoxy]benzenepropanoic acid, methyl 4-[[3-(2-pyrimidinyl)phenyl]methoxy]benzenepropanoate, 4-[[3-(2-thienyl)phenyl]methoxy]benzenepropanoic acid, methyl 4-[[3-(2-thienyl)phenyl]methoxy]benzenepropanoate, 4-[[3-(2-thienyl)phenyl]methoxy]benzenepropanoic acid and methyl 4-[[3-(2-thienyl)phenyl]methoxy]benzenepropanoate).