ARP-100 is a potent and selective matrix metalloproteinase MMP-2 inhibitor (IC50=12 nM). ARP-100 interacts with S1＇ pocket of MMP-2 and shows anti-invasive properties in an in vitro model of invasion on matrigel. ARP-100 shows the less inhibitory activity towards MMP-1 (>50 μM), MMP-3 (4.5 μM), MMP-7 (>50 μM), and MMP-9 (0.2 μM)[1][2].