22663
MATERIALS AND METHODS : Sixty - four samples with different proportions of compounds were prepared from Caesalpinia sappan L . by supercritical CO2 fluid extraction ( SCFE ) and refluxing .
 Chemical: CO2
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: CO2