A compound represented by the formula: wherein the partial structure: is wherein R 14 is a hydrogen atom, a halogen atom, a C 1-3 alkyl group or a cyano group; R 1 and R 2 are the same or different and each is a cyclic group selected from (i) a C 6-14 aryl group, (ii) a C 3-14 cycloalkyl group, (iii) a C 3-14 cycloalkenyl group, (iv) a 4- to 7-membered nonaromatic heterocyclic group containing 1 - 3 heteroatoms such as a nitrogen atom, an oxygen atom, a sulfur atom, (v) a 5- or 6-membered aromatic heterocyclic group and (vi) a fused ring group of a 5- or 6- membered aromatic heterocyclic group, wherein the cyclic group may optionally have 1 to 5 substituent(s) selected from a halogen atom, nitro, cyano, hydroxy, C 1-6 alkoxy optionally having 1 to 3 halogen atoms, C 6-14 aryloxy, C 7-16 aralkyloxy, mercapto, C 1-6 alkylthio optionally having 1 to 3 halogen atoms, C 6-14 arylthio, C 7-16 aralkylthio, amino, mono-C 1-6 alkylamino, mono-C 6-14 arylamino, mono-C 7-16 aralkylamino, di-C 1-6 alkylamino, di-C 6-14 arylamino, di-C 7-16 aralkylamino, formyl, C 1-6 alkyl-carbonyl, C 6-14 aryl-carbonyl, carboxyl, C 1-6 alkoxy-carbonyl, C 6-14 aryloxy-carbonyl, carbamoyl, thiocarbamoyl, mono-C 1-6 alkyl-carbamoyl, di-C 1-6 alkyl-carbamoyl, C 6-14 aryl-carbamoyl, C 1-6 alkylsulfonyl optionally having 1 to 3 halogen atoms, C 6-14 arylsulfonyl, C 1-6 alkylsulfinyl, C 6-14 arylsulfinyl, formylamino, C 1-6 alkyl-carbonylamino, C 6-14 aryl-carbonylamino, C 1-6 alkoxy-carbonylamino, C 1-6 alkylsulfonylamino, C 6-14 arylsulfonylamino, C 1-6 alkyl-carbonyloxy, C 6-14 aryl-carbonyloxy, C 1-6 alkoxy-carbonyloxy, mono-C 1-6 alkyl-carbamoyloxy, di-C 1-6 alkyl-carbamoyloxy, C 6-14 aryl-carbamoyloxy, 5- to 7-membered saturated cyclic amino optionally containing, besides carbon atoms and a nitrogen atom, 1 or 2 kinds of 1 to 4 heteroatoms selected from a nitrogen atom, a sulfur atom and an oxygen atom, a 5- to 10-membered aromatic heterocyclic group containing, besides carbon atoms, 1 or 2 kinds of 1 to 4 heteroatoms selected from a nitrogen atom, a sulfur atom and an oxygen atom, C 1- 3 alkylenedioxy, C 3-7 cycloalkyl, C 1-6 alkyl optionally having 1 to 3 halogen atoms or a hydroxy group, C 2-6 alkenyl optionally having 1 to 3 halogen atoms, C 2-6 alkynyl, mono-C 3-7 cycloalkyl-carbamoyl, and a 5- or 10-membered heterocyclyl-carbonyl containing, besides carbon atoms, 1 or 2 kinds of 1 to 4 heteroatoms selected from a nitrogen atom, a sulfur atom and an oxygen atom; R 3 and R 4 are the same or different and each is a hydrogen atom or an alkyl group; Y is -CH 2 -, -CH(CH 3)-, -C(CH 3) 2 -, -CH -, -CH(CO 2 CH 3)-, - CH(CH 2 OH)-, -CO-, -O-, -NH-, -N(CH 3)-, -NH-CO-, -N(COCH 3)-, -S-, -S-CH 2 -, -SO-, -SO 2 -CH 2 -, -SO 2 -C(CH 3) 2 -, -SO 2 -NH- or -SO 2 -N(CH 3)-; or a salt thereof. R 14 is a hydrogen atom, a halogen atom, a C 1-3 alkyl group or a cyano group; R 1 and R 2 are the same or different and each is a cyclic group selected from (i) a C 6-14 aryl group, (ii) a C 3-14 cycloalkyl group, (iii) a C 3-14 cycloalkenyl group, (iv) a 4- to 7-membered nonaromatic heterocyclic group containing 1 - 3 heteroatoms such as a nitrogen atom, an oxygen atom, a sulfur atom, (v) a 5- or 6-membered aromatic heterocyclic group and (vi) a fused ring group of a 5- or 6- membered aromatic heterocyclic group, wherein the cyclic group may optionally have 1 to 5 substituent(s) selected from a halogen atom, nitro, cyano, hydroxy, C 1-6 alkoxy optionally having 1 to 3 halogen atoms, C 6-14 aryloxy, C 7-16 aralkyloxy, mercapto, C 1-6 alkylthio optionally having 1 to 3 halogen atoms, C 6-14 arylthio, C 7-16 aralkylthio, amino, mono-C 1-6 alkylamino, mono-C 6-14 arylamino, mono-C 7-16 aralkylamino, di-C 1-6 alkylamino, di-C 6-14 arylamino, di-C 7-16 aralkylamino, formyl, C 1-6 alkyl-carbonyl, C 6-14 aryl-carbonyl, carboxyl, C 1-6 alkoxy-carbonyl, C 6-14 aryloxy-carbonyl, carbamoyl, thiocarbamoyl, mono-C 1-6 alkyl-carbamoyl, di-C 1-6 alkyl-carbamoyl, C 6-14 aryl-carbamoyl, C 1-6 alkylsulfonyl optionally having 1 to 3 halogen atoms, C 6-14 arylsulfonyl, C 1-6 alkylsulfinyl, C 6-14 arylsulfinyl, formylamino, C 1-6 alkyl-carbonylamino, C 6-14 aryl-carbonylamino, C 1-6 alkoxy-carbonylamino, C 1-6 alkylsulfonylamino, C 6-14 arylsulfonylamino, C 1-6 alkyl-carbonyloxy, C 6-14 aryl-carbonyloxy, C 1-6 alkoxy-carbonyloxy, mono-C 1-6 alkyl-carbamoyloxy, di-C 1-6 alkyl-carbamoyloxy, C 6-14 aryl-carbamoyloxy, 5- to 7-membered saturated cyclic amino optionally containing, besides carbon atoms and a nitrogen atom, 1 or 2 kinds of 1 to 4 heteroatoms selected from a nitrogen atom, a sulfur atom and an oxygen atom, a 5- to 10-membered aromatic heterocyclic group containing, besides carbon atoms, 1 or 2 kinds of 1 to 4 heteroatoms selected from a nitrogen atom, a sulfur atom and an oxygen atom, C 1- 3 alkylenedioxy, C 3-7 cycloalkyl, C 1-6 alkyl optionally having 1 to 3 halogen atoms or a hydroxy group, C 2-6 alkenyl optionally having 1 to 3 halogen atoms, C 2-6 alkynyl, mono-C 3-7 cycloalkyl-carbamoyl, and a 5- or 10-membered heterocyclyl-carbonyl containing, besides carbon atoms, 1 or 2 kinds of 1 to 4 heteroatoms selected from a nitrogen atom, a sulfur atom and an oxygen atom; R 3 and R 4 are the same or different and each is a hydrogen atom or an alkyl group; Y is -CH 2 -, -CH(CH 3)-, -C(CH 3) 2 -, -CH -, -CH(CO 2 CH 3)-, - CH(CH 2 OH)-, -CO-, -O-, -NH-, -N(CH 3)-, -NH-CO-, -N(COCH 3)-, -S-, -S-CH 2 -, -SO-, -SO 2 -CH 2 -, -SO 2 -C(CH 3) 2 -, -SO 2 -NH- or -SO 2 -N(CH 3)-; or a salt thereof.