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Pyrrolidine dithiocarbamate ( PDTC ) , a specific NF - kappa B inhibitor , along with 20S proteasome inhibitor ( PSI ) significantly inhibited LPS - induced iNOS expression , which indirectly suggested that 5HHMF downregulated iNOS expression by suppressing NF - kappa B activity .
 Pyrrolidine dithiocarbamate, PDTC, 5HHMF
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Pyrrolidine dithiocarbamate, PDTC, 5HHMF