Heterocyclic compounds

A heterocyclic compound of the following formula (I):

• wherein X is sulfur atom, oxygen atom or —NR3a— (in which R3a is hydrogen atom, C1-10 alkyl group, C3-7 cycloalkyl group, or C1-10 alkyl substituted by C3-6 cyclo-alkyl group, hydroxy group, C3-6 alkoxy group, amino group, cyano group, aryl group, aryl group substituted by C1-6 alkoxy, hydroxy or halogen, halogen atom, or nitro group, or
• may form a heterocyclic ring or a substituted heterocyclic ring together with R1 via the nitrogen atom, wherein said substituent means C1-6 alkyl group, hydroxy C1-6 alkyl group, C1-6 alkoxy C1-6 alkyl group, hydroxy group, C1-6 alkoxy group, or cyano group),
• R1 is C1-10 alkyl group;
• C3-7 cycloalkyl group;
• C3-7 cycloalkyl substituted by C1-6 alkyl;
• a group selected from C1-10 alkyl group, C3-7 cycloalkyl group or C1-6 alkyl-substituted C3-7 cycloalkyl group, which is substituted by
• C3-6 cycloalkyl group, hydroxy group, C1-6 alkoxy group,
• C1-6 alkoxy group substituted by C1-6 alkoxy, hydroxy or halogen,
• amino group, C1-6 alkylamino group, cyano group, nitro group, acyl group, carboxyl group, C2-7 alkoxycarbonyl group, halogen atom, mercapto group, C1-6 alkylthio group,
• C1-6 alkylthio group substituted by C1-6 alkoxy, C1-6 alkylthio, hydroxy or halogen, aryl group, aryl group substituted by C1-6 alkoxy, hydroxy or halogen, or heterocyclic group;
• aryl group;
• aryl group substituted by
• C1-6 alkyl group, hydroxy C1-6 alkyl group,
• C1-6 alkoxy C1-6 alkyl group, hydroxy group, C1-6 alkoxy group, cyano group, amino group, C1-6 alkylamino group, C2-7 alkoxycarbonyl group, acyl group, nitro group, halogen atom, aryl group, aryl group substituted by C1-6 alkoxy, hydroxy or halogen, or heterocyclic group;
• heterocyclic group;
• or heterocyclic group substituted by
• C1-6 alkyl group, hydroxy C1-6 alkyl group, C1-6 alkoxy C1-6 alkyl group, hydroxy group, C1-6 alkoxy group, cyano group, nitro group, halogen atom, amino group, C1-6 alkylamino group, C2-7 alkoxycarbonyl group, acyl group, aryl group, aryl group substituted by C1-6 alkoxy, hydroxy or halogen or
• heterocyclic group, and
• R2 is hydrogen atom, or one or more substituents on the benzene ring, and said substituent is the same or different and is hydroxy group, C1-6 alkyl group, C1-6 alkyl group substituted by hydroxy group, C1-6 alkoxy group, carboxyl, C2-7 alkoxycarbonyl group or halogen atom, C1-6 alkoxy group,
• C1-6 alkoxy group substituted by hydroxy group, C1-6 alkoxy group, carboxyl, C2-7 alkoxycarbonyl group or halogen atom, C1-6 alkanoyl group,
• C1-6 alkanoyl group substituted by hydroxy group, C1-6 alkoxy group, carboxyl, C2-7 alkoxycarbonyl group or halogen atom, aroyl group, aroyl group substituted by hydroxy group, C1-6 alkoxy group, carboxyl, C2-7 alkoxycarbonyl group or halogen atom, carboxyl group, C2-7 alkoxycarbonyl group, C2-7 alkoxycarbonyl group substituted by hydroxy group, C1-6 alkoxy group, carboxyl,
• C2-7 alkoxycarbonyl group or halogen atom,
• amino group, C1-6 alkylamino group, di(C1-6 alkyl)amino group, carbamoyl group, C1-6 alkylcarbamoyl group, di(C1-6 alkyl)carbamoyl group, halogen atom, nitro group, or cyano group,
• or a pharmaceutically acceptable salt thereof.