14240
The dosing strategy 44 . 44 / 5 . 56 mg / kg / dose piperacillin / tazobactam every 8 or 12 h evaluated in this study achieved the pharmacodynamic target ( free piperacillin concentrations > 4 mg / L for more than 50 % of the dosing interval ) in about 67 % of infants .
 Chemical: piperacillin; Chemical: tazobactam; Chemical: piperacillin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: piperacillin; Chemical: tazobactam; Chemical: piperacillin