13778
The P = O group of DMMP interacts predominantly with H ( 2 ) O and gives no clear indication of bonding to the oxide surface itself , from which it is inferred that the displacement of weakly adsorbed H ( 2 ) O results from the interaction of acidic Al - OH sites with the methoxy O atoms of DMMP .
 P = O, DMMP, H ( 2 ) O, oxide, H ( 2 ) O, Al - OH, methoxy, O, DMMP
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 P = O, DMMP, H ( 2 ) O, oxide, H ( 2 ) O, Al - OH, methoxy, O, DMMP