11365
This finding suggests that PEI combined with liposomes and with slightly decreased numbers of primary amines may be an effective vaginally administrated antiviral drug , and secondary and tertiary amine residues of PEI may contribute to the inhibitory efficiency against viral infection .
 Chemical: PEI; Chemical: primary amines; Chemical: secondary and tertiary amine; 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: PEI; Chemical: primary amines; Chemical: secondary and tertiary amine; Chemical: PEI