1. A pharmaceutical composition for treating bipolar disorder, comprising administering to a mammal in need of such treatment a therapeutically effective amount of a compound of structural formula (1) or a pharmaceutically acceptable salt or amide thereof: wherein R is selected from the group consisting of hydrogen, lower alkyl of 1- 8 carbon atoms, a halogen selected from F, Cl, Br and I, alkoxy of 1-3 carbon atoms, nitro group, hydroxy, trifluoromethyl and thioalkoxy of 1-3 carbon atoms； x is an integer from 1 to 3, provided that R can be the same or different when x is 2 or 3； R and R may be the same or different from each other and independently selected from the group consisting of hydrogen, lower alkyl of 1-8 carbon atoms, aryl of 3-7 carbon atoms, arylalkyl of 3-7 carbon atoms and cycloalkyl of 3-7 carbon atoms； R and R can be combined to form a 5-7 membered heterocycle substituted with a substituent selected from the group consisting of hydrogen, alkyl of 1-8 carbon atoms and aryl of 3- 7 carbon atoms, where the heterocyclic compound contains 1-2 nitrogen atoms and 0-1 an oxygen atom, and nitrogen atoms are not directly bonded to each other or to an oxygen atom. 2. The pharmaceutical composition of claim 1, wherein R is hydrogen. The pharmaceutical composition of claim 1, wherein R, R and R are hydrogen. The pharmaceutical composition according to claim 1, wherein the compound of structural formula (1) is an enantiomer substantially free of other enantiomers, or an enantiomeric mixture wherein one enantiomeric compound of structural formula (1) predominates. The pharmaceutical composition according to claim 4, where one enantiomer pr�1. Фармацевтическая композиция для лечения биполярного расстройства, включающая введение млекопитающему, нуждающемуся в таком лечении, терапевтически эффективного количества соединения структурной формулы (1) или его фармацевтически приемлемой соли или амида:,гдеR выбран из группы, состоящей из водорода, низшего алкила из 1-8 ат
