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The molar MR relaxivities ( r2 ) value at 1 . 5T was threefold higher than that of Resovist (R) and demonstrated that TSS - SPIONs have the potential as very effective T2 contrast - enhancement agent .
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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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