FIELD: chemistry, pharmaceutics.
SUBSTANCE: claimed invention relates to novel compounds of formula (I) and their pharmaceutically acceptable salts. Compounds of claimed invention possess properties of agonists of mGlu 1 receptors and can find application in treatment of such diseases as psychosis, schizophrenia, Alzheimer's disease, etc. In general formula (I) 
one of R1 and R2 stands for trifluoromethyl, the other stands for hydrogen; R3, R3' independently on each other stand for hydrogen or halogen.
EFFECT: obtaining medication which possesses properties of agonists of mGlu 1 receptors.
7 cl, 2 tbl, 2 dwg, 17 ex
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