AHK 126828-32-8 H-Ala-His-Lys-OH GHK 72957-37-0 H-Gly-His-Lys-OH (GHK)2Cu 49557-75-7 (Gly-His-Lys)2Cu (AHK)2Cu (Ala-His-Lys)2Cu (AHK)Cu (Ala-His-Lys)Cu Palmitoyl Tripeptide-1, Pal-GHK 147732-56-7 Pal-Gly-His-Lys-OH Palmitoyl Tripeptide-3, Pal-AHK Pal-Ala-His-Lys-OH