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Supramolecular chemistry has recently emerged as a promising way to modulate protein functions , but devising molecules that will interact with a protein in the desired manner is difficult as many competing interactions exist in a biological environment ( with solvents , salts or different sites for the target biomolecule ) .
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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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