18664
In situ forming reduction - sensitive degradable nanogels were designed and developed based on poly ( ethylene glycol ) - b - poly ( 2 - ( hydroxyethyl ) methacrylate - co - acryloyl carbonate ) ( PEG - P ( HEMA - co - AC ) ) block copolymers for efficient loading as well as triggered intracellular release of proteins .
 Chemical: poly ( ethylene glycol ) - b - poly ( 2 - ( hydroxyethyl ) methacrylate - co - acryloyl carbonate ); Chemical: PEG - P ( HEMA - co - AC )
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 ) - b - poly ( 2 - ( hydroxyethyl ) methacrylate - co - acryloyl carbonate ); Chemical: PEG - P ( HEMA - co - AC )