13135
The addition of surfactants in the cyclopentane phase significantly reduced the cyclopentane hydrate cohesive force ; we hypothesize this behavior to be the result of surfactant adsorption on the hydrate - oil interface .
 Chemical: cyclopentane; Chemical: cyclopentane hydrate
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: cyclopentane; Chemical: cyclopentane hydrate