Abstract: The present invention provides a novel compound that has anti-RSV activity and that is useful in the prevention or treatment of an infection in which viruses of the subfamily Pneumovirinae, including respiratory syncytial virus (RSV), are involved, or a pharmaceutically acceptable salt thereof. Specifically, the present invention provides a compound represented by formula (I): or a pharmaceutically acceptable salt thereof.

Abstract: A useful novel compound that shows superior antibacterial activity also against erythromycin resistant bacteria, for example, resistant pneumococci, streptococci, mycoplasmas, and the like, against which sufficient antibacterial activity cannot be obtained with conventional macrolide antibiotics, or a pharmaceutically acceptable salt thereof, or a hydrate or a solvate thereof.

Abstract: This 2-pyridone compound represented by formula [1] or a tautomer of said compound, or a pharmaceutically acceptable salt of said compound or said tautomer, or a solvate of said compound or the like has a superior GK-activating effect and is useful as a pharmaceutical.

Abstract: This 2-pyridone compound represented by formula [1] or a tautomer of said compound, or a pharmaceutically acceptable salt of said compound or said tautomer, or a solvate of said compound or the like has a superior UK-activating effect and is useful as a pharmaceutical.

Abstract: A 2-pyridone compound represented by the formula [1]: {wherein in the formula [1], the ring represented by A represents a benzene ring or a pyridine ring, X represents any of the structures represented by the formulas [3] shown below: V represents a single bond or a lower alkylene group, and W represents a single bond, an ether bond or a lower alkylene group (wherein the lower alkylene group may contain an ether bond)}, a tautomer or stereoisomer of the compound, a pharmaceutically acceptable salt thereof, or a solvate thereof is a compound that has an excellent GK activating effect and is useful as a pharmaceutical.

Abstract: A 2-pyridone compound represented by the formula [1]: {wherein in the formula [1], the ring represented by A represents a benzene ring or a pyridine ring, X represents any of the structures represented by the formulas [3] shown below: V represents a single bond or a lower alkylene group, and W represents a single bond, an ether bond or a lower alkylene group (wherein the lower alkylene group may contain an ether bond)}, a tautomer or stereoisomer of the compound, a pharmaceutically acceptable salt thereof, or a solvate thereof is a compound that has an excellent GK activating effect and is useful as a pharmaceutical.

Abstract: Disclosed is a pyrazinamide compound represented by the formula (1), a tautomer, stereoisomer or pharmaceutically acceptable salt thereof, or a solvate of the compound or the tautomer, stereoisomer or pharmaceutically acceptable salt thereof, which has an excellent GK-activating activity and is therefore useful as a medicinal agent. (1) wherein R1 represents a hydrogen atom, a C1-8 alkyl group, a C3-8 cycloalkyl group, a C2-9 heterocyclyl group, a phenyl group, a C1-9 heteroaryl group, a C7-14 arylalkyl group or the like; R2 represents a C1-8 alkyl group, a C2-9 heterocyclyl group, a phenyl group, a C1-9 heteroaryl group or the like; Ar represents a monocyclic or fused polycyclic C1-9 heteroaryl group represented by the formula (2) or a C2-9 heterocyclyl group represented by formula (2); Y represents —S—, —O— or —NH—; and Z represents —S—, —O— or —CH2—.