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NC / Nga mice were exposed orally to pesticides parathion ( an organophosphate compound ) or methoxychlor ( an organochlorine compound ) , or to an insecticide synergist piperonyl butoxide , prior to OVA intraperitoneal sensitization and inhalation challenge .
 parathion, organophosphate, methoxychlor, organochlorine, piperonyl butoxide
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 parathion, organophosphate, methoxychlor, organochlorine, piperonyl butoxide