Sumitomo Chemical Company, Limited

Kunio Shiba

Akira Yoshitake

Iwao Nakatsuka

Masami Okuno

Nobuo Ueda

Masaaki Hazue

Keietsu Takahashi

Yoshiaki Murakami

The present invention relates to a novel radioactive benzodiazepine derivative represented by the formula: ##STR1## wherein R is hydrogen or a lower alkyl; X* is radioactive iodine or bromine; Y is hydrogen or a halogen; and Z is a halogen or nitro group; and the salt thereof. The compound of the present invention enables to non-invasively detect the presence of benzodiazepine receptors in human or animal brains, other organs or tissues. Additionally, it enables to dynamically trace the change in receptor concentration either. It is very useful as a radioactive diagnostic agent for nuclear medicine in vitro or in vivo or as a radiopharmaceutical.

Radioactive benzodiazepine derivatives

The present invention relates to a novel radioactive benzodiazepine derivative represented by the formula: ##STR1## wherein R is hydrogen or a lower alkyl; X* is radioactive iodine or bromine; Y is hydrogen or a halogen; and Z is a halogen or nitro group; and the salt thereof. The compound of the present invention enables to non-invasively detect the presence of benzodiazepine receptors in human or animal brains, other organs or tissues. Additionally, it enables to dynamically trace the change in receptor concentration either. It is very useful as a radioactive diagnostic agent for nuclear medicine in vitro or in vivo or as a radio-pharmaceutical.

A protein-polysuccinimide complex wherein a biologically active protein is combined with a polysuccinimide having a mean molecular weight of 2,000 to 1,000,000 and consisting of constitutive units represented by the following formulae: ##STR1## Said complex can be labelled with a radio-metal and can be used as a radioactive diagnostic in the field of nuclear medicine.

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Takarazuka, Japan

Kunio Shiba