FIELD: pharma chemistry.
SUBSTANCE: group of inventions includes a compound of formula
where X is bromine or hydroxy, as well as a method for obtaining a compound of formula (III). The method is carried out by obtaining a bromine derivative of compound 10 which is further subjected to 18-F fluorination. In the formula (III) R3 represents a group selected from
.
EFFECT: intermediate compounds for the preparation of a visualizing agent for tau proteins having improved metabolic and stability properties in vivo.
, 
12 cl, 11 dwg, 2 tab, 6 ex
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