Patent ID: 7723307

Claim:
A compound having the following formula I: wherein: ‘X’ represents an α-amino acid group wherein the α-amino group of the amino acid is bound to the R 1 —O—CO— group and the carboxy group of the amino acid is bound to the R 2 —CH 2 —CO—(CH 2 ) n —CH(CO 2 H)—NH— group; ‘n’ is an integer between 1 and 4; ‘R 1 ’ represents benzyl, t-butyl or 9-fluorenylmethyl; and ‘R 2 ’ represents wherein R 3 , R 4 , R 5 and R 6 each independently represent lower alkyl or —S + R 7 R 8 , wherein R 7 and R 8 each independently represent lower alkyl or a pharmaceutically and/or veterinarily acceptable salt or solvate thereof.