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Green and gold kiwifruit peel ethanol extracts potentiate pentobarbital - induced sleep in mice via a GABAergic mechanism .
 Chemical: ethanol; Chemical: pentobarbital
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: ethanol, pentobarbital 
Answer:
 Chemical: ethanol; Chemical: pentobarbital