Highly potent and selective MMP13 inhibitor (IC50 = 6.9 pM). Exhibits >2600-fold selectivity for MMP13 over related MMPs. Inhibits degradation of bovine nasal septum cartilage explants in vitro . Orally bioavailable. Nara et al (2014) Thieno[2,3-d]pyrimidine-2-carboxamides bearing a carboxybenzene group at 5-position: highly potent, selective, and orally available MMP-13 inhibitors interacting with the S1 binding site. Bioorg.Med.Chem. 22 5487 PMID:25192810