Patent ID: 8709431

Claim:
A compound having a structure represented by formula (Ia): wherein R 1a is H, C 1 -C 6 alkyl, (CH 2 ) n NH 2 , C(═O)(CH 2 ) n NH 2 , C(═O)CHR 8 NH 2 , or C(═O)R 9 NH 2 ; R 8 is the side chain residue of an α-amino acid selected from the group consisting of alanine, arginine, asparagine, aspartic acid, γ-carboxyglutamic acid, citrulline, cysteine, glutamic acid, glutamine, glycine, histidine, isoleucine, leucine, lysine, methionine, norleucine, norvaline, ornithine, phenylalanine, serine, threonine, tryptophan, tyrosine, and valine; R 9 is unsubstituted or substituted arylene, unsubstituted or substituted heteroarylene, unsubstituted or substituted alkylarylene, unsubstituted or substituted cycloalkylene or unsubstituted or substituted heterocycloalkylene; and n is 2, 3, 4, 5, or 6; or a pharmaceutically acceptable salt thereof.