26336
However , the hydrophilic aminated polyoxyethylene prefers to reside at the vicinity of headgroup of PhyEO20 reducing the interhead repulsion , increasing the critical packing parameter and the viscosity as well .
 Chemical: polyoxyethylene; Chemical: PhyEO20
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: polyoxyethylene, PhyEO20 
Answer:
 Chemical: polyoxyethylene; Chemical: PhyEO20