5549
Furthermore , at high benzene loading , the migration of benzene in the small cavities was prevented ( frozen ) below 135 K .
 Chemical: benzene; Chemical: benzene
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: benzene; Chemical: benzene