AMINO ACID DERIVATIVES AND PHARMACEUTICALLY ACCEPTABLE BASIC SALTS THEREOF METHODS OF PREPARING AMINO ACID DERIVATIVES AND PHARMACEUTICAL COMPOSITION HAVING ANTIVIRAL ACTIVITY Russian patent published in 1998 - IPC

FIELD: chemical industry and pharmaceutical industry. SUBSTANCE: present invention describes amino acid derivatives of formula I: wherein R¹ is C₁-C₈ alkoxycarbonyl or group of formula: wherein R² is C₁-C₈ alkyl; R³ is hydrogen, and R⁴ is hydroxy group or R³ and R⁴ in combination are oxo group; R⁵ is C₁-C₈ alkoxycarbonyl or C₁-C₈-alkylcarbamoyl; R⁶ and R⁷ in combination are trimethylene or tetramethylene; R⁸ is phenyl-C₁-C₈ alkoxycarbonyl, quinolylcarbonyl; R⁹ is C₁-C₈ alkyl, phenyl-C₁-C₈ alkyl, cyano-C₁-C₈ alkyl, carbamoyl-C₁-C₈ alkyl, C₁-C₈-alkyltyl-C₁-C₈ alkyl, carbamoyl-C₁-C₈ alkyl or pharmaceutically acceptable basic salts thereof and are used for prophylaxis or treatment of viral infections. They are prepared by well known methods. EFFECT: improved properties of the pharmaceutical composition. 19 cl, 1 tbl