(2R,3Z,5R)-3-(2-hydroxyethylidene)-7-oxo-4-oxa-1-azabicyclo[3.2.0]heptane-2-carboxylic acid; Isoclavulanic Acid; Clavulanate; Clavulansaeure; Z-(3R,5R)-2-(β-Hydroxyethylidene)clavam-3-carboxylic Acid; (2R,5R,Z)-3-(2-hydroxyethylidene)-7-oxo-4-oxa-1-azabicyclo[3.2.0]heptane-2-carboxylic Acid; Clavulanic Acid (USP); Clavulanic Acid