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PLA - PCL - PEG - PCL - PLA copolymers with different block ratio of PCL / PLA segment were synthesized .
 Chemical: PLA; Chemical: PCL; Chemical: PEG; Chemical: PCL; Chemical: PLA; Chemical: PCL; Chemical: PLA
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: PLA; Chemical: PCL; Chemical: PEG; Chemical: PCL; Chemical: PLA; Chemical: PCL; Chemical: PLA