(3R,4R)-Tetrahydro-N-hydroxy-4-[[4-[[2-(trifluoromethyl)-1H-benzimidazol-1-yl]methyl]benzoyl]amino]-2H-pyran-3-carboxamide, in conjunction with unique constrained β-amino hydroxamic acid scaffolds for the discovery of potent selective inhibitors of TNF-α Converting Enzyme (TACE).