8637
Interestingly , all HEPES molecules entirely aggregated in pure THF .
 Chemical: HEPES; Chemical: THF
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: HEPES, THF 
Answer:
 Chemical: HEPES; Chemical: THF