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And it provided efficient and practical ways for the preparation of a variety of well - defined functional heterocyclic compounds with the advantages of good yields , high purity , straightforward operations , broad range and high diversity of the products , lack of odor , and good stability of the resins , all of these give expression to green chemistry .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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