| abstract |
The invention is concerned with amino acid derivatives of the formula wherein E represents -CHO or -B(OH)2 and R1, R2, R3, R4, R5, R6, R7, R8 and R9 have the significances given in the description, and salts of acidic compounds of formula I with bases, which are viral proteinase inhibitors useful as antiviral agents, especially for the treatment or prophylaxis of infections caused by Hepatitis C, Hepatitis G and human GB viruses. |