26788
A Butterfly - Shaped Pyrene Derivative of Cholesterol and Its Uses as a Fluorescent Probe .
 Chemical: Pyrene; Chemical: Cholesterol
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: Pyrene; Chemical: Cholesterol