22232
Toward that , we present the functionalization of rigid native cellulose nanocrystals ( CNCs ) by esterification with a dense hydrocarbon chain brush containing cross - linkable double bonds .
 Chemical: hydrocarbon
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: hydrocarbon