6924
Montmorillonite ( MTM ) and a " new " unmodified biological polymer ( xyloglucan ( XG ) ) are combined .
 Montmorillonite, MTM
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Montmorillonite, MTM