Radioactive diagnostic agent and non-radioactive carrier therefor

摘要

A 99mTc-labeled radioactive diagnostic agent being useful for visualization and dynamic inspection of hepatobiliary ducts and having a high stability and no material toxicity, which comprises 99mTc in the form of pertechnetate and a non-radioactive carrier, the non-radioactive carrier comprising an N-pyridoxyl- alpha -amino acid of the formula: <IMAGE> wherein R1 and R2 are each an atom or an atomic group present in the alpha -amino acid residue encompassed by the dotted line and R3, R4, R5 and R6 are each a hydrogen atom, a halogen atom, a C1-C10 alkyl group or a C1-C10 alkyl group substituted with at least one hydrophilic group or its salt, and a reducing agent for pertechnetate.