wherein X represents sulfur atom;

A¹ represents a group that links the nitrogen atom to which A¹ is bonded and A² in the form of N—(CH₂)₂-A²;

A² represents a group binding A¹ and G¹ in the form of A¹-C(═O)-G¹, A¹-NH-G¹ or A¹-NHC(═O)-G¹;

G¹ represents one group selected from among the following 1) to 4):

1) a single bond

2) a substituted or unsubstituted C_3-8 alicyclic hydrocarbon group (as substituents there may be mentioned one or more selected from the group consisting of fluorine, chlorine, bromine, iodine, hydroxyl, optionally substituted C_1-7 alkoxy, C_6-10 aryloxy, C_7-9 aralkoxy, C_2-7 acyloxy, oxo, C_1-6 alkylsulfonyloxy, optionally substituted C_2-7 acyl (the acyl is selected from acetyl, propionyl, butyryl, isobutyryl, valeryl, isovaleryl, pivaloyl, and hexanoyl), carboxyl, C_2-7 alkoxycarbonyl, carbamoyl, optionally substituted C_2-7 alkylcarbamoyl, amino, optionally substituted C_1-6 alkylamino, optionally substituted C_2-7 acylamino, C_2-8 alkoxycarbonylamino, C_1-6 alkylsulfonylamino, cyano, nitro, C_1-6 alkylthio, C_1-6 alkylsulfinyl, C_1-6 alkylsulfonyl, sulfamoyl, C_1-6 alkylaminosulfonyl, sulfo, optionally substituted C_3-6 alicyclic hydrocarbons and optionally substituted C_1-6 aliphatic hydrocarbons)

3) a substituted or unsubstituted C_6-14 aromatic hydrocarbon group (as substituents there may be mentioned one or more selected from the group consisting of fluorine, chlorine, bromine, iodine, hydroxyl, optionally substituted C_1-7 alkoxy, C_6-10 aryloxy, C_7-9 aralkoxy, C_2-7 acyloxy, C_1-6 alkylsulfonyloxy, optionally substituted C_2-7 acyl (the acyl is selected from acetyl, propionyl, butyryl, isobutyryl, valeryl, isovaleryl, pivaloyl, and hexanoyl), carboxyl, C_2-7 alkoxycarbonyl, carbamoyl, optionally substituted C_2-7 alkylcarbamoyl, amino, optionally substituted C_1-6 alkylamino, optionally substituted C_2-7 acylamino, C_2-8 alkoxycarbonylamino, C_1-6 alkylsulfonylamino, cyano, nitro, C_1-6 alkylthio, C_1-6 alkylsulfinyl, C_1-6 alkylsulfonyl, sulfamoyl, C_1-6 alkylaminosulfonyl, sulfo, optionally substituted C_3-6 alicyclic hydrocarbons and optionally substituted C_1-6 aliphatic hydrocarbons)

4) a substituted or unsubstituted divalent heterocyclic group selected from the group consisting of furan, thiophene, pyrrole, pyrroline, pyrrolidine, oxazole, oxazolidine, isooxazole, isooxazolidine, thiazole, thiazolidine, isothiazole, isothiazolidine, furazan, imidazole, imidazoline, imidazolidine, pyrazole, pyrazoline, pyrazolidine, triazole, thiadiazole, oxadiazole, tetrazole, pyran, tetrahydropyran, thiopyran, tetrahydrothiopyran, tetrahydrofuran, 1,3-dioxolane, 1,4-dioxane, pyridine, pyrazine, pyrimidine, pyridazine, benzofuran, dibenzofuran, 1,4-dioxacycloheptane, benzothiophene, indole, 1,2-methylenedioxybenzene, benzimidazole, benzothiazole, benzoxazole, chromane, isochromane, quinoline, decahydroquinoline, isoquinoline, phthalazine, cinnoline, 1,8-naphthylidine, 1,2,3,4-tetrahydroisoquinoline, quinazoline, quinoxaline, purine, pteridine, azetidine, morpholine, thiomorpholine, piperidine, homopiperidine, piperazine, homopiperazine, indoline, isoindoline, phenoxazine, phenazine, phenothiazine, pyrrolopyrimidine, pyrazolopyrimidine and quinuclidine, wherein the heterocyclic group is bonded to A² via a carbon or nitrogen atom (as substituents there may be mentioned one or more selected from the group consisting of fluorine, chlorine, bromine, iodine, hydroxyl, optionally substituted C_1-7 alkoxy, C_6-10 aryloxy, C_7-9 aralkoxy, C_2-7 acyloxy, oxo, C_1-6 alkylsulfonyloxy, optionally substituted C_2-7 acyl (the acyl is selected from acetyl, propionyl, butyryl, isobutyryl, valeryl, isovaleryl, pivaloyl, and hexanoyl), carboxyl, C_2-7 alkoxycarbonyl, carbamoyl, optionally substituted C_2-7 alkylcarbamoyl, amino, optionally substituted C_1-6 alkylamino, optionally substituted C_2-7 acylamino, C_2-8 alkoxycarbonylamino, C_1-6 alkylsulfonylamino, cyano, nitro, C_1-6 alkylthio, C_1-6 alkylsulfinyl, C_1-6 alkylsulfonyl, sulfamoyl, C_1-6 alkylaminosulfonyl, sulfo, optionally substituted C_3-6 alicyclic hydrocarbons and optionally substituted C_1-6 aliphatic hydrocarbons);

A³ represents a single bond, or a C_1-6 aliphatic hydrocarbon group having G¹ and A⁴ bonded on the same or different carbon atoms;

A⁴ represents a single bond or a group binding A³ and G² in the form of A³-C(═O)-G², A³-C(═O)O-G², A³-C(═O)NR¹²¹-G², A³-C(═S)NR¹²²-G², A³-C(═NR¹²³)-G², A³-O-G², A³-OC(═O)-G², A³-NR¹²⁴-G², A³-NR¹²⁵C(═O)-G², A³-NR¹²⁶S(═O)₂-G², A³-NR¹²⁷C(═O)O-G², A³-NR¹²⁸C(═O)NR¹²⁹-G², A³-NR¹³⁰C(═S)-G², A³-NR¹³¹C(═S)NR¹³²-G², A³-S-G², A³-S(═0)-G², A³-S(═O)²-G², A³-S(═O)₂NR¹³³-G² or A³-S(═O)₂O-G² (where R¹²¹, R¹²², R¹²³, R¹²⁴, R¹²⁵, R¹²⁶, R¹²⁷, R¹²⁸, R¹²⁹, R¹³⁰, R¹³¹, R¹³², and R¹³³ each independently represent hydrogen or a C_1-4 aliphatic hydrocarbon group); and

G² represents one group selected from among the following 1) to 5):

1) hydrogen;

2) a substituted or unsubstituted C_1-10 aliphatic hydrocarbon group (as substituents there may be mentioned one or more selected from the group consisting of fluorine, chlorine, bromine, iodine, hydroxyl, optionally substituted C_1-7 alkoxy, C_6-10 aryloxy, C_7-9 aralkoxy, C_2-7 acyloxy, oxo, C_1-6 alkylsulfonyloxy, optionally substituted C_2-7 acyl (the acyl is selected from acetyl, propionyl, butyryl, isobutyryl, valeryl, isovaleryl, pivaloyl, and hexanoyl), carboxyl, C_2-7 alkoxycarbonyl, carbamoyl, optionally substituted C_2-7 alkylcarbamoyl, amino, optionally substituted C_1-6 alkylamino, optionally substituted C_2-7 acylamino, C_2-8 alkoxycarbonylamino, C_1-6 alkylsulfonylamino, cyano, nitro, C_1-6 alkylthio, C_1-6 alkylsulfinyl, C_1-6 alkylsulfonyl, sulfamoyl, C_1-6 alkylaminosulfonyl, sulfo, optionally substituted C_3-6 alicyclic hydrocarbons, optionally substituted C_1-6 aliphatic hydrocarbons, optionally substituted C_6-14 aromatic hydrocarbons and optionally substituted heterocyclic groups (having in the ring 1 to 4 atoms selected from the group consisting of oxygen, nitrogen and sulfur))

3) a substituted or unsubstituted C_3-8 alicyclic hydrocarbon group (as substituents there may be mentioned one or more selected from the group consisting of fluorine, chlorine, bromine, iodine, hydroxyl, optionally substituted C_1-7 alkoxy, C_6-10 aryloxy, C_7-9 aralkoxy, C_2-7 acyloxy, oxo, C_1-6 alkylsulfonyloxy, optionally substituted C_2-7 acyl (the acyl is selected from acetyl, propionyl, butyryl, isobutyryl, valeryl, isovaleryl, pivaloyl, and hexanoyl), carboxyl, C_2-7 alkoxycarbonyl, carbamoyl, optionally substituted C_2-7 alkylcarbamoyl, amino, optionally substituted C_1-6 alkylamino, optionally substituted C_2-7 acylamino, C_2-8 alkoxycarbonylamino, C_1-6 alkylsulfonylamino, cyano, nitro, C_1-6 alkylthio, C_1-6 alkylsulfinyl, C_1-6 alkylsulfonyl, sulfamoyl, C_1-6 alkylaminosulfonyl, sulfo, optionally substituted C_3-6 alicyclic hydrocarbons, optionally substituted C_1-6 aliphatic hydrocarbons, optionally substituted C_6-14 aromatic hydrocarbons and optionally substituted heterocyclic groups (having in the ring 1 to 4 atoms selected from the group consisting of oxygen, nitrogen and sulfur))

4) a substituted or unsubstituted C_6-14 aromatic hydrocarbon group (as substituents there may be mentioned one or more selected from the group consisting of fluorine, chlorine, bromine, iodine, hydroxyl, optionally substituted C_1-7 alkoxy, C_6-10 aryloxy, C_7-9 aralkoxy, C_2-7 acyloxy, C_1-6 alkylsulfonyloxy, optionally substituted C_2-7 acyl (the acyl is selected from acetyl, propionyl, butyryl, isobutyryl, valeryl, isovaleryl, pivaloyl, and hexanoyl), carboxyl, C_2-7 alkoxycarbonyl, carbamoyl, optionally substituted C_2-7 alkylcarbamoyl, amino, optionally substituted C_1-6 alkylamino, optionally substituted C_2-7 acylamino, C_2-8 alkoxycarbonylamino, C_1-6 alkylsulfonylamino, cyano, nitro, C_1-6 alkylthio, C_1-6 alkylsulfinyl, C_1-6 alkylsulfonyl, sulfamoyl, C_1-6 alkylaminosulfonyl, sulfo, optionally substituted C_3-6 alicyclic hydrocarbons, optionally substituted C_1-6 aliphatic hydrocarbons, optionally substituted C_6-14 aromatic hydrocarbons and optionally substituted heterocyclic groups (having in the ring 1 to 4 atoms selected from the group consisting of oxygen, nitrogen and sulfur))

5) a substituted or unsubstituted monovalent heterocyclic group selected from the group consisting of furan, thiophene, pyrrole, pyrroline, pyrrolidine, oxazole, oxazolidine, isooxazole, isooxazolidine, thiazole, thiazolidine, isothiazole, isothiazolidine, imidazole, imidazoline, imidazolidine, pyrazole, pyrazoline, pyrazolidine, triazole, thiadiazole, oxadiazole, tetrazole, pyran, tetrahydropyran, thiopyran, tetrahydrothiopyran, pyridine, pyrazine, pyrimidine, pyridazine, benzofuran, dibenzofuran, benzothiophene, indole, 1,2-methylenedioxybenzene, benzimidazole, benzothiazole, benzoxazole, chromane, isochromane, quinoline, decahydroquinoline, isoquinoline, quinazoline, quinoxaline, purine, pteridine, azetidine, morpholine, thiomorpholine, piperidine, homopiperidine, piperazine, homopiperazine, indoline, isoindoline, phenoxazine, phenazine, phenothiazine and quinuclidine, wherein the heterocyclic group is bonded to A⁴ via a carbon or nitrogen atom (as substituents there may be mentioned one or more selected from the group consisting of fluorine, chlorine, bromine, iodine, hydroxyl, optionally substituted C_1-7 alkoxy, C_6-10 aryloxy, C_7-9 aralkoxy, C_2-7 acyloxy, oxo, C_1-6 alkylsulfonyloxy, optionally substituted C_2-7 acyl (the acyl is selected from acetyl, propionyl, butyryl, isobutyryl, valeryl, isovaleryl, pivaloyl, and hexanoyl), carboxyl, C_2-7 alkoxycarbonyl, carbamoyl, optionally substituted C_2-7 alkylcarbamoyl, amino, optionally substituted C_1-6 alkylamino, optionally substituted C_2-7 acylamino, C_2-8 alkoxycarbonylamino, C_1-6 alkylsulfonylamino, cyano, nitro, C_1-6 alkylthio, C_1-6 alkylsulfinyl, C_1-6 alkylsulfonyl, sulfamoyl, C_1-6 alkylaminosulfonyl, sulfo, optionally substituted C_3-6 alicyclic hydrocarbons, optionally substituted C_1-6 aliphatic hydrocarbons, optionally substituted C_6-14 aromatic hydrocarbons and optionally substituted heterocyclic groups (having in the ring 1 to 4 atoms selected from the group consisting of oxygen, nitrogen and sulfur))

(the above being with the following provisos:

a) when G¹ and A³ are both single bonds, then A¹, A², A⁴ and G² together are A¹-C(═O)—C(═O)-G², and

b) when A³ represents a C_1-6 aliphatic hydrocarbon group having G¹ and A⁴ bonded on the same or different carbon atoms and G² represents a substituted or unsubstituted C_1-10 aliphatic hydrocarbon group, then A⁴ is not a single bond)

A⁵ represents a single bond, or a group binding the carbon atom of the pyrrole ring to which A⁵ is bonded and R² in the form of R²—NR²⁰¹-pyrrole ring carbon (where R²⁰¹ represents hydrogen or a C_1-4 aliphatic hydrocarbon group)

R² represents one group selected from among the following 1) to 6):

1) hydrogen

2) fluorine, chlorine, bromine or iodine

3) a substituted or unsubstituted C_1-10 aliphatic hydrocarbon group (as substituents there may be mentioned one or more selected from the group consisting of fluorine, chlorine, bromine, iodine, hydroxyl, optionally substituted C_1-7 alkoxy, C_6-10 aryloxy, C_7-9 aralkoxy, C_2-7 acyloxy, oxo, C_1-6 alkylsulfonyloxy, optionally substituted C_2-7 acyl (the acyl is selected from acetyl, propionyl, butyryl, isobutyryl, valeryl, isovaleryl, pivaloyl, and hexanoyl), carboxyl, C_2-7 alkoxycarbonyl, carbamoyl, optionally substituted C_2-7 alkylcarbamoyl, amino, optionally substituted C_1-6 alkylamino, optionally substituted C_2-7 acylamino, C_2-8 alkoxycarbonylamino, C_1-6 alkylsulfonylamino, cyano, nitro, C_1-6 alkylthio, C_1-6 alkylsulfinyl, C_1-6 alkylsulfonyl, sulfamoyl, C_1-6 alkylaminosulfonyl, sulfo, optionally substituted C_3-6 alicyclic hydrocarbons, optionally substituted C_1-6 aliphatic hydrocarbons, optionally substituted C_6-14 aromatic hydrocarbons and optionally substituted heterocyclic groups (having in the ring 1 to 4 atoms selected from the group consisting of oxygen, nitrogen and sulfur))

4) a substituted or unsubstituted C_3-8 alicyclic hydrocarbon group (as substituents there may be mentioned one or more selected from the group consisting of fluorine, chlorine, bromine, iodine, hydroxyl, optionally substituted C_1-7 alkoxy, C_6-10 aryloxy, C_7-9 aralkoxy, C_2-7 acyloxy, oxo, C_1-6 alkylsulfonyloxy, optionally substituted C_2-7 acyl (the acyl is selected from acetyl, propionyl, butyryl, isobutyryl, valeryl, isovaleryl, pivaloyl, and hexanoyl), carboxyl, C_2-7 alkoxycarbonyl, carbamoyl, optionally substituted C_2-7 alkylcarbamoyl, amino, optionally substituted C_1-6 alkylamino, optionally substituted C_2-7 acylamino, C_2-8 alkoxycarbonylamino, C_1-6 alkylsulfonylamino, cyano, nitro, C_1-6 alkylthio, C_1-6 alkylsulfinyl, C_1-6 alkylsulfonyl, sulfamoyl, C_1-6 alkylaminosulfonyl, sulfo, optionally substituted C_3-6 alicyclic hydrocarbons, optionally substituted C_1-6 aliphatic hydrocarbons, optionally substituted C_6-14 aromatic hydrocarbons and optionally substituted heterocyclic groups (having in the ring 1 to 4 atoms selected from the group consisting of oxygen, nitrogen and sulfur))

5) a substituted or unsubstituted C_6-14 aromatic hydrocarbon group (as substituents there may be mentioned one or more selected from the group consisting of fluorine, chlorine, bromine, iodine, hydroxyl, optionally substituted C_1-7 alkoxy, C_6-10 aryloxy, C_7-9 aralkoxy, C_2-7 acyloxy, oxo, C_1-6 alkylsulfonyloxy, optionally substituted C_2-7 acyl (the acyl is selected from acetyl, propionyl, butyryl, isobutyryl, valeryl, isovaleryl, pivaloyl, and hexanoyl), carboxyl, C_2-7 alkoxycarbonyl, carbamoyl, optionally substituted C_2-7 alkylcarbamoyl, amino, optionally substituted C_1-6 alkylamino, optionally substituted C_2-7 acylamino, C_2-8 alkoxycarbonylamino, C_1-6 alkylsulfonylamino, cyano, nitro, C_1-6 alkylthio, C_1-6 alkylsulfinyl, C_1-6 alkylsulfonyl, sulfamoyl, C_1-6 alkylaminosulfonyl, sulfo, optionally substituted C_3-6 alicyclic hydrocarbons, optionally substituted C_1-6 aliphatic hydrocarbons, optionally substituted C_6-14 aromatic hydrocarbons and optionally substituted heterocyclic groups (having in the ring 1 to 4 atoms selected from the group consisting of oxygen, nitrogen and sulfur))

6) a substituted or unsubstituted monovalent heterocyclic group selected from the group consisting of furan, thiophene, pyrrole, pyrroline, pyrrolidine, oxazole, oxazolidine, isooxazole, isooxazolidine, thiazole, thiazolidine, isothiazole, isothiazolidine, imidazole, imidazoline, imidazolidine, pyrazole, pyrazoline, pyrazolidine, triazole, thiadiazole, oxadiazole, tetrazole, pyran, tetrahydropyran, thiopyran, tetrahydrothiopyran, pyridine, pyrazine, pyrimidine, pyridazine, benzofuran, dibenzofuran, benzothiophene, indole, 1,2-methylenedioxybenzene, benzimidazole, benzothiazole, benzoxazole, chromane, isochromane, quinoline, decahydroquinoline, isoquinoline, quinazoline, quinoxaline, purine, pteridine, azetidine, morpholine, thiomorpholine, piperidine, homopiperidine, piperazine, homopiperazine, indoline, isoindoline, phenoxazine, phenazine, phenothiazine and quinuclidine, wherein the heterocyclic group is bonded to A⁵ via a carbon or nitrogen atom (as substituents there may be mentioned one or more selected from the group consisting of fluorine, chlorine, bromine, iodine, hydroxyl, optionally substituted C_1-7 alkoxy, C_6-10 aryloxy, C_7-9 aralkoxy, C_2-7 acyloxy, oxo, C^1-6 alkylsulfonyloxy, optionally substituted C_2-7 acyl (the acyl is selected from acetyl, propionyl, butyryl, isobutyryl, valeryl, isovaleryl, pivaloyl, and hexanoyl), carboxyl, C_2-7 alkoxycarbonyl, carbamoyl, optionally substituted C_2-7 alkylcarbamoyl, amino, optionally substituted C_1-6 alkylamino, optionally substituted C_2-7 acylamino, C_2-8 alkoxycarbonylamino, C_1-6 alkylsulfonylamino, cyano, nitro, C_1-6 alkylthio, C_1-6 alkylsulfinyl, C_1-6 alkylsulfonyl, sulfamoyl, C_1-6 alkylaminosulfonyl, sulfo, optionally substituted C_3-6 alicyclic hydrocarbons, optionally substituted C_1-6 aliphatic hydrocarbons, optionally substituted C_6-14 aromatic hydrocarbons and optionally substituted heterocyclic groups (having in the ring 1 to 4 atoms selected from the group consisting of oxygen, nitrogen and sulfur))

the above being with the proviso that when R² is fluorine, chlorine, bromine or iodine, A⁵ is a single bond

wherein the heterocyclic groups as substituents for the C_1-10 aliphatic hydrocarbon groups, the C_3-8 alicyclic hydrocarbon groups, the C_6-14 aromatic hydrocarbon groups, and the heterocyclic groups represented by G² and R² are monovalent heterocyclic groups independently selected from the group consisting of furan, thiophene, pyrrole, pyrroline, pyrrolidine, oxazole, oxazolidine, isooxazole, isooxazolidine, thiazole, thiazolidine, isothiazole, isothiazolidine, imidazole, imidazoline, imidazolidine, pyrazole, pyrazoline, pyrazolidine, triazole, thiadiazole, oxadiazole, tetrazole, pyran, tetrahydropyran, thiopyran, tetrahydrothiopyran, pyridine, pyrazine, pyrimidine, pyridazine, benzofuran, dibenzofuran, benzothiophene, indole, benzimidazole, benzothiazole, benzoxazole, chromane, isochromane, quinoline, decahydroquinoline, isoquinoline, quinazoline, quinoxaline, purine, pteridine, azetidine, morpholine, thiomorpholine, piperidine, homopiperidine, piperazine, homopiperazine, indoline, isoindoline, phenoxazine, phenazine, phenothiazine and quinuclidine, and which are bonded to the C_1-10 aliphatic hydrocarbon groups, the C_3-8 alicyclic hydrocarbon groups, the C_6-14 aromatic hydrocarbon groups, and the heterocyclic groups represented by G² and R² via a carbon atom or a nitrogen atom.