Patent ID: 7846970

Claim:
A hydroxycitric acid derivative represented by the formula (I) below or salt thereof: wherein R 1 and R 2 are each a hydrogen atom or a group removable by biological enzyme reaction (with the proviso that R 1 and R 2 cannot be hydrogen atoms at the same time), the removable group being selected from those represented by the formula (Ia) below; X 1 to X 3 are each a nitrogen atom or an oxygen atom; and R 3 , R 4 , R 5 , R 3′ , R 4′ and R 5′ are each a hydrogen atom or a chain hydrocarbon group of 1 to 30 carbon atoms that may have a branch or an unsaturated bond (with the proviso that when any of X 1 , X 2 and X 3 is an oxygen atom, corresponding R 3′ , R 4′ or R 5′ does not exist); wherein R 6 is a hydrogen atom, a phenyl group, a naphthyl group, a furyl group, a thienyl group, a pyridyl group, or a chain hydrocarbon group of 7 to 23 carbon atoms that may have a branch, an unsaturated bond or a substituent group selected from the group consisting of a halogen atom, an amino group, a cyano group, an alkoxy group and a nitro group, and R 7 and R 8 are each a hydrogen atom, an aryl group, or a chain hydrocarbon group of 1 to 30 carbon atoms that may have a branch, an unsaturated bond or a substituent group selected from the group consisting of a halogen atom, an amino group, a cyano group, an alkoxy group and a nitro group.