3861
Pharmacological blockade of local TRPA1 by its selective antagonist HC 030031 prevented and reversed carrageenan - induced hyperalgesia , which was detected either by a mechanical or chemical ( low dose of capsaicin ) stimulus .
 HC 030031, capsaicin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 HC 030031, capsaicin