RADIOACTIVE DIAGNOSTIC AGENT AND NON-RADIOACTIVE CARRIER THEREFOR

摘要

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