bmy 28100 , a new oral cephalosporin with a ( z ) -propenyl side chain at the 3 position and a p-hydroxyphenylglycyl substituent at the 7 position , was evaluated in comparison with cefaclor and cephalexin and , when appropriate , ampicillin and vancomycin .
C0007537
cefaclor
C0007716
cephalexin