The skin of the gaur deters landing and feeding by mosquitoes by secreting an oily substance, a novel 18-carbon acid.

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"Gaur acid (...) was recently isolated from the oily secretion of the gaur (B. frontalis), a wild ox in Asia, by Oliver et al.[9, 10] This 18-carbon acid is thought to serve as a landing and feeding deterrent for the yellow-fever mosquito (Aedes aegypti)." (Evans 2004)

Journal article
Stereodivergent Construction of Cyclic Ethers by a Regioselective and Enantiospecific Rhodium-Catalyzed Allylic Etherification: Total Synthesis of Gaur AcidAngewandte ChemieSeptember 14, 2004
P. Andrew Evans, David K. Leahy, William J. Andrews, Daisuke Uraguchi

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