A compound represented by the following formula or a salt thereof, wherein: R 1 represents a hydrogen atom, C 1-6 alkyl or trifluoromethyl; R 2 represents a hydrogen atom, C 1-6 alkyl, halogen, -COO(C 1-6 alkyl) or -(CH 2) 1-3 COOR (R represents a hydrogen atom or C 1-6 alkyl); R 3 represents a hydrogen atom, C 1-6 alkyl, amino, trifluoromethyl or -OR (R represents a hydrogen atom or C 1-6 alkyl); R 4 represents a hydroxyl group; R 5 represents a hydrogen atom, C 1-6 alkyl, a hydroxyl group or halogen; R 6 represents a C 1-6 alkyl, trifluoromethyl, halogen, amino, -NR a R b, nitro, hydroxy C 1-6 alkyl, -CONR a R b, -COO(C 1-6 alkyl), -COOH, -(CH 2) 1-3 COOR, or -OR a (R represents a hydrogen atom or C 1-6 alkyl, and R a and R b may be the same or different from each other and represent a hydrogen atom, C 1-6 alkyl or C 1-6 acyl); R 7 represents a hydrogen atom, C 1-6 alkyl, -OR (R represents a hydrogen atom or C 1-6 alkyl), or halogen; and R 8 represents a hydrogen atom, C 1-6 alkyl, a hydroxyl group, amino or nitro, with the proviso that when R 1 is a hydrogen atom, R 3 is not a hydrogen atom, and the compound wherein R 1 is tert-butyl, R 3 is amino, R 4 is a hydroxyl group and R 6 is methyl is excluded, or selected from one of the following: 2-(3,5-dimethyl-1H-pyrazol-1-yl)-4-fluorophenol 2-(5-hydroxy-3-methyl-1H-pyrazol-1-yl)phenol 2-(5-methyl-3-(trifluoromethyl)-1H-pyrazol-1-yl)phenol 2-(3,5-bistrifluoromethyl)-1H-pyrazol-1-yl)phenol 2-(5-methyl-1H-pyrazol-1-yl)phenol 2-(3,4,5-trimethyl-1H-pyrazol-1-yl)phenol 2-(5-amino-3-tert-butyl-1H-pyrazol-1-yl)phenol 4-chloro-2-(3,5-dimethyl-1H-pyrazol-1-yl)phenol 2-chloro-6-(3,5-dimethyl-1H-pyrazol-1-yl)phenol 2-(4-chloro-3, 5-dimethyl-1H-pyrazol-1-yl)phenol 2-(3,5-diethyl-1H-pyrazol-1-yl)phenol 3-(3,5-dimethyl-1H-pyrazol-1-yl)benzene-1,2-diol 2-(4-ethyl-3,5-dimethyl-1H-pyrazol-1-yl)phenol 4-fluoro-2-(3,4,5-trimethyl-1H-pyrazol-1-yl)phenol ethyl 1-(2-hydroxyphenyl)-3,5-dimethyl-1H-pyrazol-4-carboxylate methyl 3-(1-(2-hydroxyphenyl)-3,5-dimethyl-1H-pyrazol-4-yl)propanoate 2-(4-butyl-3,5-dimethyl-1H-pyrazol-1-yl)phenol 2-(3, 5-dimethyl-1 H-pyrazol-1-yl)-3-nitrophenol 3-(1-(2-hydroxyphenyl)-3,5-dimethyl-1H-pyrazol-4-yl)propionic acid 3-amino-2-(3,5-dimethyl-1H-pyrazol-1-yl)phenol 2-(3,5-dimethyl-1H-pyrazol-1-yl)benzene-1,3-diol 2-(3,5-dimethyl-1H-pyrazol-1-yl)-3-methylphenol 2-(3,5-dimethyl-1H-pyrazol-1-yl)-4-methylphenol 2-(3,5-dimethyl-1H-pyrazol-1-yl)-6-methylphenol 2-(4-fluoro-3,5-dimethyl-1H-pyrazol-1-yl)phenol or a salt thereof. R 1 represents a hydrogen atom, C 1-6 alkyl or trifluoromethyl; R 2 represents a hydrogen atom, C 1-6 alkyl, halogen, -COO(C 1-6 alkyl) or -(CH 2) 1-3 COOR (R represents a hydrogen atom or C 1-6 alkyl); R 3 represents a hydrogen atom, C 1-6 alkyl, amino, trifluoromethyl or -OR (R represents a hydrogen atom or C 1-6 alkyl); R 4 represents a hydroxyl group; R 5 represents a hydrogen atom, C 1-6 alkyl, a hydroxyl group or halogen; R 6 represents a C 1-6 alkyl, trifluoromethyl, halogen, amino, -NR a R b, nitro, hydroxy C 1-6 alkyl, -CONR a R b, -COO(C 1-6 alkyl), -COOH, -(CH 2) 1-3 COOR, or -OR a (R represents a hydrogen atom or C 1-6 alkyl, and R a and R b may be the same or different from each other and represent a hydrogen atom, C 1-6 alkyl or C 1-6 acyl); R 7 represents a hydrogen atom, C 1-6 alkyl, -OR (R represents a hydrogen atom or C 1-6 alkyl), or halogen; and R 8 represents a hydrogen atom, C 1-6 alkyl, a hydroxyl group, amino or nitro, with the proviso that when R 1 is a hydrogen atom, R 3 is not a hydrogen atom, and the compound wherein R 1 is tert-butyl, R 3 is amino, R 4 is a hydroxyl group and R 6 is methyl is excluded, 2-(3,5-dimethyl-1H-pyrazol-1-yl)-4-fluorophenol 2-(5-hydroxy-3-methyl-1H-pyrazol-1-yl)phenol 2-(5-methyl-3-(trifluoromethyl)-1H-pyrazol-1-yl)phenol 2-(3,5-bistrifluoromethyl)-1H-pyrazol-1-yl)phenol 2-(5-methyl-1H-pyrazol-1-yl)phenol 2-(3,4,5-trimethyl-1H-pyrazol-1-yl)phenol 2-(5-amino-3-tert-butyl-1H-pyrazol-1-yl)phenol 4-chloro-2-(3,5-dimethyl-1H-pyrazol-1-yl)phenol 2-chloro-6-(3,5-dimethyl-1H-pyrazol-1-yl)phenol 2-(4-chloro-3, 5-dimethyl-1H-pyrazol-1-yl)phenol 2-(3,5-diethyl-1H-pyrazol-1-yl)phenol 3-(3,5-dimethyl-1H-pyrazol-1-yl)benzene-1,2-diol 2-(4-ethyl-3,5-dimethyl-1H-pyrazol-1-yl)phenol 4-fluoro-2-(3,4,5-trimethyl-1H-pyrazol-1-yl)phenol ethyl 1-(2-hydroxyphenyl)-3,5-dimethyl-1H-pyrazol-4-carboxylate methyl 3-(1-(2-hydroxyphenyl)-3,5-dimethyl-1H-pyrazol-4-yl)propanoate 2-(4-butyl-3,5-dimethyl-1H-pyrazol-1-yl)phenol 2-(3, 5-dimethyl-1 H-pyrazol-1-yl)-3-nitrophenol 3-(1-(2-hydroxyphenyl)-3,5-dimethyl-1H-pyrazol-4-yl)propionic acid 3-amino-2-(3,5-dimethyl-1H-pyrazol-1-yl)phenol 2-(3,5-dimethyl-1H-pyrazol-1-yl)benzene-1,3-diol 2-(3,5-dimethyl-1H-pyrazol-1-yl)-3-methylphenol 2-(3,5-dimethyl-1H-pyrazol-1-yl)-4-methylphenol 2-(3,5-dimethyl-1H-pyrazol-1-yl)-6-methylphenol 2-(4-fluoro-3,5-dimethyl-1H-pyrazol-1-yl)phenol