4464
Phenolic compounds were characterised by nuclear magnetic resonance ( NMR ) spectroscopy , and ultra performance liquid chromatography with photodiode array detector and electrospray ionisation / mass ( UPLC - PDA - ESI / MS ) analysis .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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