A compound that has affinity with amyloid, exhibits sufficiently rapid clearance from normal tissues, and is suppressed in toxicity such as mutagenicity is provided, which is represented by the following formula (1):
or a salt thereof,
wherein R
1
is a group selected from hydrogen, hydroxyl group, carboxyl group, sulfate group, amino group, nitro group, cyano group, an alkyl substituent with one to 4 carbon atoms or an alkoxy substituent with one to 4 carbon atoms; R
2
is a radioactive halogen substituent; and m is an integer of 0 to 2, and a low-toxic diagnostic agent for Alzheimer's disease comprising a compound represented by the above formula or a salt thereof is also provided.
                            提供了一种与淀粉样物质具有亲和力、从正常组织中清除速度足够快且毒性被抑制(例如突变毒性)的化合物,该化合物由以下式子(1)表示:或其盐,其中R1是从氢、羟基、羧基、
硫酸基、
氨基、硝基、
氰基、具有一到四个碳原子的烷基取代基或具有一到四个碳原子的烷氧基取代基中选择的基团;R2是放射性卤素取代基;m是0到2的整数。还提供了一种低毒性的阿尔茨海默病诊断剂,其包括上述式子或其盐所表示的化合物。