IBI-246 is a chemical found in wild grown tomatoes. It is used in cosmetics, and research from North Carolina State University has shown that it may be useful as a
mosquito repellent, as effective or more effective than
DEET.
References
Article at http://www.sciencedaily.com/releases/2002/06/020611070622.htm
University link http://ipm.ncsu.edu/current_ipm/Broadcasts/broadcast06-02b.html