4079
During the sediment exposure , racemic fipronil in sediment was transformed primarily to fipronil sulfide , while exposed fish rapidly accumulated fipronil and / or fipronil sulfide and transformed the majority to fipronil sulfone .
 fipronil, fipronil sulfide, fipronil, fipronil sulfide, fipronil sulfone
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 fipronil, fipronil sulfide, fipronil, fipronil sulfide, fipronil sulfone