4520
The designed drug delivery system contained low concentration of Poloxamer 407 ( P407 ) ( < 0 . 16 % ) with polyvinyl alcohol ( PVA ) as a polymeric additive .
 Chemical: Poloxamer 407; Chemical: P407; Chemical: polyvinyl alcohol; Chemical: PVA
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: Poloxamer 407; Chemical: P407; Chemical: polyvinyl alcohol; Chemical: PVA