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The effect of cholesterol was investigated by comparing anesthetic interactions with POPC / SM liposomes and POPC / SM / CHOL liposomes .
 Chemical: cholesterol; Chemical: POPC; Chemical: POPC; Chemical: CHOL
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: cholesterol; Chemical: POPC; Chemical: POPC; Chemical: CHOL