1472
PATIENTS : Sixty patients were pretreated in a randomized double - blinded fashion with remifentanil 1 microg / kg or placebo .
 Chemical: remifentanil
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: remifentanil