FIELD: organic chemistry, medicine, pharmacy. SUBSTANCE: invention relates to derivative of thiophene of the formula (I) 
where Ra and Rb can be similar or different and they mean hydrogen atom, alkyl, acyl, alkenyl, phenyl; or Ra and Rb in common can form benzene ring or cyclohexene ring, its pharmaceutically acceptable salts and hydrates. Compound of the formula (I) is useful as new antipsychotic agent exhibiting efficiency with respect both positive and negative symptoms in schizophrenia and gives less dangerous adverse effects. Except for, this compound is useful as medicinal agent for treatment of Alzheimer's disease and circular psychosis. EFFECT: valuable medicinal properties of compound. 18 cl
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