Patent ID: 7038074

Claim:
A compound of structural formula I: wherein: L 1 is a linker which is a member selected from the group consisting of —CO—, —CO—NH—, and —COO; R 4 is t-butyl, phenyl, benzyl, fluorenyl, or adamantyl; L 2 is a linker which is a member selected from the group consisting of a bond, —OR 5 —, —NH—R 5 —, —NH—NH—R 5 , and —CH 2 —R 5 —, wherein R 5 is —(CH 2 ) m — and m is 1 to 3, or L 2 is a linker which is NH—CHR 9 —COO—(CH 2 ) m wherein m is 1 to 5 and R 9 is a derivatized or underivatized side chain of a natural amino acid; R 7 is a phenyl, piperidinepyrrol, furan, thiophene, pyridine, naphthalene, anthracene or indole radical which is unsubstituted or is substituted by one or more R 8 radicals, wherein R 8 is a basic substituent or a substituent functioning as a hydrogen bond donor or acceptor or a halogen; and R 3 is an amidino, guanidino, amino, alkylamino, aminoalkyl or amide radical and is at the 3 position of the aromatic ring of the phenylalanine radical.