Patent ID: 7999132

Claim:
An anthranilic acid compound represented by formula (I): wherein, R 1 represents a hydrogen atom or a carboxyl protecting group; R 2 represents a phenyl, cycloalkyl or heterocyclic group which is optionally substituted with at least one group selected from the group consisting of a halogen atom; a cyano group; a nitro group; an acyl group; an acyloxy group; a sulfo group; a phosphoryl group; an alkanesulfonyl group; an alkanesulfonamide group; an acetamide group; a carbamoyl group; a carboxyl group that is optionally protected; an amino group that is optionally protected; a hydroxyl group that is optionally protected; an alkyl group that is optionally substituted; an alkenyl group that is optionally substituted; an alkynyl group that is optionally substituted; an alkoxy group that is optionally substituted; an aryl group that is optionally substituted; a cyclic amino group that is optionally substituted; an aralkyl group that is optionally substituted; and a heterocyclic group that is optionally substituted; R 3 represents a phenyl, cycloalkyl, cycloalkenyl, indolyl, indolinyl, 2-oxoindolinyl, isoindolyl, indolizinyl, benzimidazolyl, benzotriazolyl, indazolyl, quinolyl, tetrahydroquinolinyl, tetrahydroisoquinolinyl, quinolizinyl, isoquinolyl, phthalazinyl, naphthyridinyl, quinoxalinyl, dihydroquinoxalinyl, quinazolinyl, cinnolinyl, quinuclidinyl, 2,3-dihydrobenzopyrrolyl, benzofuranyl, isobenzofuranyl, chromenyl, chromanyl, isochromanyl, benzo-1,3-dioxolyl, benzo-1,4-dioxanyl, 2,3-dihydrobenzofuranyl, benzothienyl, 2,3-dihydrobenzothienyl, benzomorpholinyl, benzomorpholonyl, benzothiazolyl, benzothiadiazolyl or monocyclic heterocyclic group which is optionally substituted; X 1 represents a carbonyl group or a sulfonyl group; X 2 represents an alkylene, alkenylene or alkynylene group which is optionally substituted or a bond; provided that when X 1 is a sulfonyl group and X 4 is a bond, X 2 represents an alkylene, alkenylene or alkynylene group which is optionally substituted; X 3 represents an oxygen atom, a sulfur atom or a bond; and X 4 represents a group represented by the general formula, —X 5 —X 6 — or —X 6 —X 5 —, wherein the bond on the left side of each general formula is linked to R 3 ; and X 5 represents an oxygen atom, a sulfur atom, an imino group which is optionally protected, a sulfinyl group, a sulfonyl group or a bond; and X 6 represents an alkylene, alkenylene or alkynylene group which is optionally substituted or a bond or a salt thereof.