888
The HPTLC and HPLC - DAD fingerprints resulted the simplest methods to differentiate the two species , whereas LC - ESI - MS was more useful to quantify arbutin , the main component of bearberry , and to evaluate its different content in the two species .
 arbutin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 arbutin