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The synthetic polymer - based sorbent Diaion HP20SS ( cross - linked polystyrene matrix ) is used as an alternative to prepare purified natural product libraries .
 Chemical: Diaion HP20SS; Chemical: polystyrene
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: Diaion HP20SS; Chemical: polystyrene