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This assembly of domains was interrogated in a model membrane system composed of palmitoyl sphingomyelin ( PSM ) , cholesterol , and an unsaturated lipid ( dioleoylphosphatidylcholine , DOPC ) .
 Chemical: palmitoyl sphingomyelin; Chemical: PSM; Chemical: cholesterol; Chemical: dioleoylphosphatidylcholine; Chemical: DOPC
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: palmitoyl sphingomyelin; Chemical: PSM; Chemical: cholesterol; Chemical: dioleoylphosphatidylcholine; Chemical: DOPC