Figure 2: GC/MS-Total Ion Chromatogram (TIC) of s-methoprene (Mol. Wt., 310.47), piperonylbutoxide (Mol. Wt., 338.44), and etofenprox (Mol. Wt., 376.49). Peaks of s-methoprene, piperonylbutoxide, and etofenprox were eluted at a retention time of 6.524 min, 7.967 min, and 10.105 min, respectively. For detailed GC/MS conditions, see the text.