20190
Polyethylene oxide ( PEO ) is used as a carrier polymer in a chemically cross - linking poly ( ethylene glycol ) - high molecular weight heparin ( PEG - HMWH ) hydrogel .
 Chemical: Polyethylene oxide; Chemical: PEO; Chemical: poly ( ethylene glycol ); Chemical: PEG
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: Polyethylene oxide; Chemical: PEO; Chemical: poly ( ethylene glycol ); Chemical: PEG