A compound represented by the following formula or a salt thereof:
wherein each of A
1
, A
2
, A
3
and A
4
independently represents a carbon or nitrogen; R
1
is a group selected from the group consisting of hydrogen, hydroxyl group, carboxyl group, sulfuric acid group, amino group, nitro group, cyano group, non-radioactive halogen substituents, alkyl substituents with 1-4 carbon atoms and alkoxy substituents with 1-4 carbon atoms; and R
2
is a radioactive halogen substituent, provided at least one of A
1
, A
2
, A
3
and A
4
represents a carbon, and R1 binds to a carbon represented by A
1
, A
2
, A
3
or A
4
, is effective as an image diagnosis probe targeting amyloid and as well as a diagnostic agent for Alzheimer's disease including the compound represented by the above formula or a salt thereof.
以下化合物或其盐所代表的化合物:
其中A1,A2,A3和A4各自独立地代表碳或氮;R1是从氢,羟基,羧基,
硫酸基,
氨基,硝基,
氰基,非放射性卤素取代基,1-4个碳原子的烷基取代基和1-4个碳原子的烷氧基取代基的群中选择的基团;而R2是放射性卤素取代基,前提是A1,A2,A3和A4中至少有一个代表碳,并且R1与A1,A2,A3或A4代表的碳结合,该化合物或其盐的有效成分作为靶向淀粉样蛋白的影像诊断探针以及阿尔茨海默病的诊断剂。