3-carbamoyl-2-pyridone derivative

The present invention provides compounds having an agonistic activity to the cannabinoid receptor, which is represented by the formula (I): wherein R 1 is optionally substituted C1-C8 alkyl and the like; R 2 is C1-C6 alkyl; R 3 is C1-C6 alkyl and the like; or R 2 and R 3 taken together with may form an optionally substituted 5 to 10 membered non-aromatic carbon ring; R 4 is hydrogen and the like; G is a group selected from the groups shown by the formula an the like: wherein R 5 is hydrogen and the like; X 1 is a single bond and the like; X 2 is optionally substituted C1-C8 alkylene that may be replaced by one or two groups of -O-, or -N(R 6 )-, wherein R 6 is hydrogen and the like, and the like; X 3 is a single bond and the like; a pharmaceutically acceptable salt or a solvate thereof, and pharmaceutical compositions, atopic dermatitis treating agents, and anti-pruritus agents, especially anti-pruritus agents for oral used and for external application, which each contains the said compound as an active ingredient.