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The model is able to account for the softening of solute - solvent interactions and its predictions are found to be in excellent agreement with the observed relaxation rate constants of a series of substituted p - phenylenevinylene trimers [ ChemPhysChem 2009 , 10 , 448 - 454 ] on T , eta and the size of the side - chains .
 Chemical: p - phenylenevinylene trimers
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: p - phenylenevinylene trimers