BLI-489 is a penem B-lactamase inhibitor, which has shown activity against class A, C, and D B-lactamases. BLI-489 is being tested in combination therapy for drug-resistant bacteria.Synonyms:(5R,6Z)-6-[(5,6-Dihydro-8H-imidazo[2,1-c][1,4]oxazin-2-yl)methylene]-7-oxo-4-thia-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic Acid Sodium Salt HydrateCAS Number:623564-40-9Molecular Formula:C₁₃H₁₀N₃NaO₄S • xH₂OMolecular Weight:327.29Form:Yellow SolidPurity:≥98%Melting Point:>200°C (dec.)Solubility:DMSO, MethanolPfizer Compound