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Level 4
  
J - Antiinfectives for systemic useJ01 - Antibacterials for systemic useJ01C - Beta-lactam antibacterials, penicillinsJ01CR - Combinations of penicillins, including beta-lactamase inhibitors
  
J01CR01 - Ampicillin and enzyme inhibitorJ01CR02 - Amoxicillin and enzyme inhibitorJ01CR03 - Ticarcillin and enzyme inhibitorJ01CR04 - SultamicillinJ01CR05 - Piperacillin and enzyme inhibitorJ01CR50 - Combinations of penicillins
  
 
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