Fipronil is a member of the class of pyrazoles that is?1H-pyrazole?that is substituted at positions 1, 3, 4, and 5 by 2,6-dichloro-4-(trifluoromethyl)phenyl, cyano, (trifluoromethyl)sulfinyl, and?amino?groups, respectively. It is a nitrile, a?dichlorobenzene, a primary?amino?compound, a member of pyrazoles, a sulfoxide and a member of (trifluoromethyl)benzenes.