Patent ID: 6849709

Claim:
A compound of the formula: wherein R 1 is N-(3-aminopropyl)-N-[(2S)-2,5-diaminovaleryl]amino, N-(3-aminopropyl)-N-[-5-amino-2-[N,N-bis(2-aminoethyl)amino]valeryl]amino, N-(3-aminopropyl)-N-[-5-amino-2-[N-(3-aminopropyl)amino]valeryl]amino, N-(2-aminoethyl)-N-[-5-amino-2-[N,N-bis(2-aminoethyl)amino]valeryl]amino or ornityl-ornitylamino; R 2 is hydrogen or methyl; R 3 is hydrogen or hydroxy; or a pharmaceutically acceptable salt thereof.