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. Author manuscript; available in PMC: 2015 Dec 1.
Published in final edited form as: Curr Opin Insect Sci. 2014 Dec 1;6:93–98. doi: 10.1016/j.cois.2014.10.007

Figure 1.

Figure 1

Structures of the major four insect repellents currently in the market. (A) DEET, (B) IR3535, (C) Picaridin, and (D) PMD. Note the lack of an amide carbonyl moiety and nitrogen atom in PMD, the only natural product in the group, compared to the synthetic counterparts.