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Propofol , a widely used intravenous general anesthetic , acts at anesthetic concentrations as a positive allosteric modulator of gamma - aminobutyric acid type A receptors and at higher concentration as an inhibitor of nicotinic acetylcholine receptors ( nAChRs ) .
 Chemical: Propofol; Chemical: gamma - aminobutyric acid; Chemical: acetylcholine
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: Propofol; Chemical: gamma - aminobutyric acid; Chemical: acetylcholine