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Successful synthesis of PACA at the hydrogel surface was confirmed and the PACA layer was identified to be most homogeneous for poly ( n - butyl - 2 - cyanoacrylate ) on both the micro - and nanolevel .
 Chemical: PACA; Chemical: PACA; Chemical: poly ( n - butyl - 2 - cyanoacrylate )
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: PACA; Chemical: PACA; Chemical: poly ( n - butyl - 2 - cyanoacrylate )