FIELD: chemistry.
SUBSTANCE: invention relates to a compound of formula (I) or pharmaceutically acceptable salts thereof. In formula (I), R1 is phenyl substituted once or twice with C1-6alkyl, halogen, trifluoromethyl or cyano; R2 is C1-6alkyl; R3 is phenyl substituted once or twice with C1-6alkyl, halogen, trifluoromethyl, cyano, C1-6alkoxy, trifluoromethoxy, -C(O)-C1-6alkoxy, or -C(O)-NR4R5, where one of R4 and R5 is hydrogen or C1-6alkyl, and the other is C1-6alkyl or C3-7cycloalkyl; but is a single bond, X is CH2 or NH. Invention also relates to individual compounds selected from the group, to a pharmaceutical composition inhibiting the production or secretion of HBsAg, to the use of the compound and to a method of treating or preventing the HBV infection. 
.
EFFECT: new compounds of formula (I) used as an inhibitor of the production or secretion of HBsAg are obtained.
18 cl, 1 tbl, 65 ex
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