In chemistry, a NONOate is a compound having the chemical formula RRN−(NO)−N=O, where R and R are alkyl groups. One example for this is 1,1-diethyl-2-hydroxy-2-nitrosohydrazine, or diethylamine dinitric oxide. These compounds are unusual in having three sequential nitrogen atoms: an amine functional group, a bridging NO group, and a terminal nitrosyl group. In contact with water, these compounds release NO (nitric oxide).