8748
The trend of the temperature - dependent wide - line ( 129 ) Xe spectra as well as the exchange in the EXSY spectra is typical for a narrow 2D pore system .
 ( 129 ) Xe
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 ( 129 ) Xe