Urokinase inhibitors, production and use thereof

A compound having a structure according to the following formula,

• or a salt thereof, wherein P1 is an amino acid residue formed from a natural or artificial basic amino acid in the L-configuration, and wherein said amino acid is selected from the group consisting of:
• Lys, homoLys, Arg, norArg, homoArg, His, Orn, Orn(2-imidazolinyl), Dab, 4-[(2-amino)pyrimidinyl]butyric acid, Dap, Ala[3-(2-pyrrolidinyl)], Ala[3-pyrrolidinyl-(2-N-amidino)], Ala[3-(N-piperazine-4-N-amidino], Ala(4-Pip), Ala[4-Pip(N-amidino)], homoAla(4-Pip), Ala[3-Pip(N-amidino)], homoAla(3-Pip), homoAla[4-Pip(N-amidino)], Ala-(3-guanidino), Phe(3-amidino), Phe(4-amidino), Phe(3-NH2), Phe(4-NH2), Phe(3-guanidino), Phe(4-guanidino), Phe[4-(2-imidazolinyl)], Phe[3-CH2-(guanidino)], Phe[4-CH2-(guanidino)], homoPhe(3-amidino), homoPhe(4-amidino), hPhe(3-NH2), hPhe(4-NH2), hPhe(3-guanidino), hPhe(4-guanidino), cis-Cha(4-NH2), trans-Cha(4-NH2), cis-homoCha(4-NH2), trans-homoCha(4-NH2), trans-Cha(4-CH2NH2), and trans-homoCha(4-CH2NH2).