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Considering that SERS can be excited and collected in near - infrared ( NIR ) therapeutic window , this technique can serve as a powerful tool to monitor the drug release in vivo , providing additional control over externally triggered drug administration .
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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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