15967
When host 1 is dissolved in organic solvents with large solvent internal pressures ( d U / d V ) T , we find that the free energy barrier to Ar - CH2 bond rotation increases by 1 - 2 kcal / mol , compared with that in aqueous solution .
 Chemical: Ar - CH2
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Ar - CH2