9470
We have synthesized linear ABC triblock terpolymers containing poly ( 1 , 3 - cyclohexadiene ) , PCHD , as an end block and characterized their morphologies in the melt .
 poly ( 1 , 3 - cyclohexadiene ), PCHD
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 poly ( 1 , 3 - cyclohexadiene ), PCHD