If you live in an area with numerous biting insects like mosquitoes, flies, ticks etc, you must have heard the use of mosquito-repellant creams. DEET is one of the active ingredients found in most of the insect repellant creams. The chemical formula for DEET is N, N-diethyl-3-methyl-benzamide. There are other chemicals like N,N diethyl benzamide