Ethyl butylacetylaminopropionate
Ethyl butylacetylaminopropionate is an insect repellent whose trade name is IR3535 and was developed and commercialized by Merck KGaA (Germany). It is a colorless and odorless oil with a good skin feel in final products, and it is biodegradable.
Source: Wikipedia — Ethyl butylacetylaminopropionate (CC BY-SA 4.0)