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3-HALOMETHYL-.DELTA.3-CEPHALOSPORIN ESTERS AND SULFOXIDES THEREOF USEFUL IN THE PRODUCTION OF ANTIBIOTICS, AND PROCESS FOR PREPARING THE NEW INTERMEDIATES AND ANTIBIOTICS
3-HALOMETHYL-.DELTA.3-CEPHALOSPORIN ESTERS AND SULFOXIDES THEREOF USEFUL IN THE PRODUCTION OF ANTIBIOTICS, AND PROCESS FOR PREPARING THE NEW INTERMEDIATES AND ANTIBIOTICS