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Para - chloromercuribenzene sulfonate ( pCMBS ) covalently modifies beta 2M286C sidechain sulfhydryls , irreversibly altering GABA - induced currents .
 Para - chloromercuribenzene sulfonate, pCMBS, sulfhydryls, GABA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Para - chloromercuribenzene sulfonate, pCMBS, sulfhydryls, GABA