3-((((((2S,5R)-2-KAPBAMOYL-7-OXO-1,6-DIAZADICYCLO[3.2.1]OCTAN-6-YL)OXY)SULFONYL)OXY)-2,2-DIMETHYLPROPANOIC DERIVATIVES AND RELATED COMPOUNDS AS ORALLY ADMINISTERED PRODRUGS OF BETA-LACTAMASE INHIBITORS FOR THE TREATMENT OF BACTERIAL INFECTIONS