LY 186826 is a γ-lactam antibiotic containing an aminothioazole methoxyacetic acid side chain at the C-7 position. LY186826 exhibits potent antibacterial activity against a wide range of Gram-positive and Gram-negative bacteria. LY186826 is inactivated by β-lactamases and Enterobacterases, showing stronger activity against Enterobacter strains.