Relebactam-d9 (MK-7655-d9) is deuterium labeled Relebactam. Relebactam is a diazabicyclooctane inhibitor with activity against a wide spectrum of beta-lactamases, including class A (extended-spectrum beta-lactamases and KPC) and class C (AmpC) enzymes. Relebactam shows antibacterial activity[1].