7525
The predicted enthalpic barrier for this proton - coupled ET ( PCET ) reaction is 45 . 7 kcal / mol for direct PT from PyH ( 0 ) to CO ( 2 ) .
 PyH ( 0 ), CO ( 2 )
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 PyH ( 0 ), CO ( 2 )