7249
The linker carbon together with the TraPPE - EH parameters for aromatic heterocycles constitutes a force field for fused - ring heterocycles .
 carbon, aromatic heterocycles, fused - ring heterocycles
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 carbon, aromatic heterocycles, fused - ring heterocycles