19864
Injectable aqueous solutions of thiolated poly ( aspartic acid ) can be converted into mechanically stable gels by oxidation , which can be useful for drug encapsulation and targeted delivery .
 Chemical: thiolated poly ( aspartic acid )
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: thiolated poly ( aspartic acid )