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7alfa - alkoxy 7beta - ketenimino - cephalosporins or 6alfa - alkoxy 6beta - keteniminopenicilliner for use as an intermediate and procedure for the manufacture of such compounds
7alfa - alkoxy 7beta - ketenimino - cephalosporins or 6alfa - alkoxy 6beta - keteniminopenicilliner for use as an intermediate and procedure for the manufacture of such compounds