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The microcapsules were subsequently placed within a poly ( ethylene glycol ) ( PEG ) - coated poly ( epsilon - caprolactone ) ( PCL ) chamber covered with a PEG - grafted PCL nanoporous membrane formed by phase inversion .
 Chemical: poly ( ethylene glycol ); Chemical: PEG; Chemical: poly ( epsilon - caprolactone ); Chemical: PCL; Chemical: PEG - grafted PCL
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 ); Chemical: PEG; Chemical: poly ( epsilon - caprolactone ); Chemical: PCL; Chemical: PEG - grafted PCL