1742
In the double proton transfer reaction , the thione dimer is found to be more stable than thiol dimer both in the gas phase and in solution phase .
 thione dimer, thiol dimer
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 thione dimer, thiol dimer