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Positive allosteric modulator of alpha 7 nicotinic - acetylcholine receptors , PNU - 120596 augments the effects of donepezil on learning and memory in aged rodents and non - human primates .
 Chemical: acetylcholine; Chemical: PNU - 120596; Chemical: donepezil
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: acetylcholine; Chemical: PNU - 120596; Chemical: donepezil