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In a randomised , double - blind , cross - over study , 30 healthy volunteers received a single intravenous bolus injection of 2 . 5 mg . kg - 1 propofol .
 Chemical: propofol
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: propofol