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With this combined method , SHV - 1 , a class A beta - lactamase , and tazobactam , a commercially available beta - lactamase inhibitor , were rapidly mixed on the millisecond time scale and then were flash - frozen by injection into an isopentane solution surrounded by liquid nitrogen .
 Chemical: tazobactam; Chemical: isopentane; Chemical: nitrogen
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: tazobactam; Chemical: isopentane; Chemical: nitrogen