5796
We determined the binding of NO ( 2 ) - H ( 2 ) O to be about two times stronger than that previously calculated .
 NO ( 2 ), H ( 2 ) O
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 NO ( 2 ), H ( 2 ) O