Aminopyridine compound

An aminopyridine compound represented by the formula (I):

• wherein
• R1, R2 and R3 are each independently represent a hydrogen atom or a C1-C6 alkyl group,
• Y represents a formula (II):
• wherein Ring A represents an aromatic ring group or a 5- to 6-membered heteroaromatic ring group, R4 represents a C1-C12 alkyl group, a halogeno-C1-C8 alkyl group, a C1-C6 alkoxy group, a halogeno-C1-C6 alkoxy group, a halogeno-C1-C6 alkoxy-C1-C6 alkyl group, a C3-C6 cycloalkyl-C1-C6 alkyl group, a C2-C6 alkenyl group or the formula (III):
• wherein R6 represents a C1-C12 alkyl group, a C1-C6 alkoxy group, a C7-C18 aralkyl group, a C1-C6 alkoxy-C1-C6 alkyl group or a C7-C18 aralkyloxy-C1-C6 alkyl group, and n is an integer of 1 to 4, p is an integer of 1 to 3, R5 represents a halogeno group or an amino group which may be substituted by a C1-C6 alkyl group, and q is an integer of 0 to 2,
• Z represents an aromatic ring group or a 5- to 6-membered heteroaromatic ring group each of which may be substituted by a group(s) selected from the group consisting of a halogeno group, a C1-C6 alkyl group, a halogeno-C1-C6 alkyl group, a C1-C6 alkoxy group and a halogeno-C1-C6 alkoxy group,
• or a pharmaceutically acceptable salt thereof.