11363
Liposome / PEI and PEI with decreased numbers of primary amine residues at a dose of 0 . 2 mg PEI / mouse exhibited more potent therapeutic antiviral activity than acyclovir and PEI alone without acute lesion appearance or toxicity pre - or postinfection , but polyallylamine was moderately effective only preinfection .
 Chemical: PEI; Chemical: PEI; Chemical: primary amine; Chemical: PEI; Chemical: acyclovir; Chemical: PEI; Chemical: polyallylamine
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: PEI; Chemical: PEI; Chemical: primary amine; Chemical: PEI; Chemical: acyclovir; Chemical: PEI; Chemical: polyallylamine