In chemistry, a NONOate is a compound having the chemical formula R1R2N−(NO−)−N=O, where R1 and R2 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).[1][2]