6644
A YMC C ( 8 ) column was used to separate the analytes before being qualitatively and quantitatively determined by liquid chromatography - electrospray ionization tandem mass spectrometry ( LC - ESI - MS / MS ) in positive ion mode using multiple reaction monitoring ( MRM ) .
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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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