Patent ID: 8703696

Claim:
A compound of the formula (I) in which R A is a group of the formula in which * means the point of linkage to the O atom, L 1 and L 2 are independently of one another a bond or —CH 2 —, R 1 , R 2 and R 3 are independently of one another hydrogen or methyl, R 4 and R 6 are identical or different and are independently of one another hydrogen or the side group of a natural α-amino acid or its homologs or isomers, R 5 and R 7 are independently of one another hydrogen or methyl, L 3 is straight-chain or branched (C 2 -C 4 )-alkanediyl which is additionally substituted by amino, R 8 , R 9 and R 10 are independently of one another hydrogen or methyl, m is the number 2, 3, 4, 5 or 6, L 4 is straight-chain or branched (C 2 -C 4 )-alkanediyl, which is additionally substituted by carboxyl, R 11 is hydrogen or methyl, and n is the number 1, 2, 3 or 4, and the salts thereof.