2622
Among three different solvent fractions of GRPE and GOPE , ethyl acetate ( EA ) fractions had the greatest effect on sleep duration at 250mg / kg .
 Chemical: ethyl acetate
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: ethyl acetate