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In this study , we report thermosensitive hydrogels based on poly ( ethylene glycol ) - block - poly ( gamma - propargyl - l - glutamate ) ( PEG - PPLG ) .
 Chemical: poly ( ethylene glycol ) - block - poly ( gamma - propargyl - l - glutamate ); Chemical: PEG - PPLG
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: poly ( ethylene glycol ) - block - poly ( gamma - propargyl - l - glutamate ); Chemical: PEG - PPLG