11357
We reported previously that topical application of branched 3610 - Da polyethylenimine ( PEI ) exhibited preventative antiviral activity .
 Chemical: polyethylenimine; Chemical: PEI
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: polyethylenimine; Chemical: PEI