Heterocyclic compound and use thereof

A compound represented by the formula (I):

• wherein
• R1 is
• wherein
• X is CH or a nitrogen atom;
• Ra is
• (1) a C1-3 alkyl group optionally substituted by fluorine atom(s),
• (2) a C3-6 cycloalkyl group optionally substituted by fluorine atom(s),
• (3) a C1-6 alkoxy group optionally substituted by fluorine atom(s), or
• (4) a C3-6 cycloalkyloxy group optionally substituted by fluorine atom(s);
• Rb is
• (1) a hydrogen atom,
• (2) a C1-6 alkyl group optionally substituted by fluorine atom(s),
• (3) a C1-6 alkoxy group optionally substituted by fluorine atom(s), or
• (4) a halogen atom;
• and
• Rc is
• (1) a C2-6 alkyl group optionally substituted by fluorine atom(s),
• (2) a C1-6 alkoxy group optionally substituted by fluorine atom(s), or
• (3) a halogen atom;
• and
• R2 is
• (1)
• wherein
• Rd is
• (a) a C3-6 cycloalkyl group optionally substituted by fluorine atom(s),
• (b) a C1-6 alkoxy group optionally substituted by fluorine atom(s),
• (c) a C3-6 cycloalkyloxy group optionally substituted by fluorine atom(s),
• (d) a difluoromethyl group, or
• (e) a trifluoromethyl group;
• and
• Rf1 and Rf2 are each independently a hydrogen atom, a fluorine atom, a chlorine atom, or a methyl group,
• (2)
• wherein
• Re is
• (a) a C3-6 cycloalkyl group optionally substituted by fluorine atom(s),
• (b) a C1-6 alkoxy group optionally substituted by fluorine atom(s),
• (c) a C3-6 cycloalkyloxy group optionally substituted by fluorine atom(s), or
• (d) a C1-2 alkyl group substituted by fluorine atom(s);
• and
• ring B is optionally further substituted by 1 to 3 substituents selected from a fluorine atom, a chlorine atom, and a methyl group, or
• (3)
• wherein
• ring C is further substituted by 1 or 2 substituents selected from
• (a) a C3-6 cycloalkyl group optionally substituted by fluorine atom(s),
• (b) a C1-6 alkoxy group optionally substituted by fluorine atom(s),
• (c) a C3-6 cycloalkyloxy group optionally substituted by fluorine atom(s), and
• (d) a C1-2 alkyl group substituted by fluorine atom(s),
• or a pharmacologically acceptable salt thereof.