21245
Because in - solution geometries change only slightly according to the IEF - PCM continuum solvent calculations in carbon tetrachloride and water , the two theoretical levels were applied further on , and complete basis set ( CBS ) relative internal free energies were estimated for the conformers under study .
 carbon tetrachloride
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 carbon tetrachloride