21492
Employing recent experimental results as the background , an alternate interpretation of the secular approximation is presented for describing and understanding the nuances of Multi - Quantum ( MQ ) NMR spectroscopy of quadrupolar nuclei .
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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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