Patent ID: 7102027

Claim:
An adamantanetricarboxylic acid derivative represented by following Formula (1): wherein X is a hydrogen atom or a hydrocarbon group; and R 1 , R 2 and R 3 may be the same as or different from one another and are each a carboxyl group which may be protected by a protecting group, or a carbonyl halide group, wherein at least one of R 1 , R 2 and R 3 is a carbonyl halide group or a carboxyl group which is protected by a protecting group selected from the group consisting of alkoxy groups, cycloalkyloxy groups, tetrahydrofuranyloxy groups, tetrahydropyranyloxy groups, aryloxy groups, aralkyloxy groups, trialkylsilyloxy groups, amino groups which may have one or more substituents, cyclic amino groups, hydrazino groups which may have one or more substituents, and acyloxy groups.