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Cellulose nanowhiskers ( CNWs , the crystalline portion of cellulose ) , microcrystalline cellulose Avicel PH101 ( partially crystalline cellulose ) , and phosphoric acid swollen cellulose ( PASC , amorphous cellulose ) were used as representative models for cellulose to better understand the binding interactions between the CBMs and different regions of native cellulose .
 Chemical: phosphoric acid
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: phosphoric acid