| 摘要 |
<p>Compounds of the following formula (I) and their pharmaceutically acceptable salts, wherein R<SUB>1</SUB> represents H or C1-C3-alkyl, R<SUB>2</SUB> represents H, CH<SUB>2</SUB>CF<SUB>3</SUB>, OCH<SUB>2</SUB>COOR<SUB>3</SUB>, or OCOOR<SUB>3</SUB>, R<SUB>3</SUB> represents CH(CH<SUB>3</SUB>)<SUB>2</SUB> or C(CH<SUB>3</SUB>)<SUB>3</SUB>, X represents O or CH<SUB>2</SUB>, n = 1-3, and their use as antiviral agents, especially as anti-hepatitis B viral agents.</p> |
