By JOHN BRENNAN, GEOFFREY RICHARDSON, and RICHARD J STOODLEY* (Department of Organzc Chemzstry, The Unzverszty, Newcastle upon Tyne NE 1 7RU) Summary 4-Iodomethylazetidin-2-one is converted into the title compounds when treated sequentially with glyoxylic acid esters and sodium hydride ... THE disclosure that clavulanic acid (l), a metabolite of Streptowzyces clavuZzgerus,l is a potent irreversible inhibitor of a wide range of ...