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In this study , we fabricated microneedles from a biocompatible polymer , namely , poly ( ethylene glycol ) diacrylate .
 Chemical: poly ( ethylene glycol ) diacrylate
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: poly ( ethylene glycol ) diacrylate 
Answer:
 Chemical: poly ( ethylene glycol ) diacrylate