申请人:CLINO LTD.
公开号:US20160008494A1
公开(公告)日:2016-01-14
An object of the present invention is to provide a probe for imaging a β-sheet structure protein which can be used for the diagnosis of conformational diseases, particularly disease (tauopathy) having a cardinal symptom such as intracerebral accumulation of tau protein, for example, Alzheimer's disease. Another object of the present invention is to provide a compound which is highly specific to tau and can image tau with satisfactory sensitivity, and also has high brain transition, low or non-recognized bone-seeking properties and low or non-recognized toxicity.
According to the present invention, the above problems are solved by providing a compound of a formula I (wherein A, R
1
, R
2
, R
3
, R
4
, R
5
, R
6
, R
a
and R
b
are as defined in the present description) or a pharmaceutically acceptable salt or solvate thereof.