FIELD: medicine.
SUBSTANCE: invention refers to a compound of formula 
(I), its optical isomer or pharmaceutically acceptable salt, R is specified in cl.1 of the patent claim. The compounds may be presented both as an optical isomer, and as a racemic substance, and may be used for mental disorders, such as schizophrenia.
EFFECT: higher efficacy of using the compounds.
8 cl, 4 tbl, 3 dwg, 7 ex
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