| abstract |
The present invention relates to compounds of the formula I. in which A and B independently represent an amino acid, X may be absent or is -O-, -S-, -CF₂-, -CO- or -CHR⁸, p and q are independently 0, 1, 2, 3 or 4 and R¹ to R⁴ are defined in the specification, and their salts.n n n The invention further relates to a process for the preparation of the compounds of the formula I and their use as medicaments. |