DPTA NONOate is a NO donor. It spontaneously dissociates in a pH-dependent, first-order process with a half-life of three hours and five hours at 37°C and 22-25°C, pH 7.4, respectively, to liberate 2 moles of NO per mole of parent compound. [1][2]
Reference:
[1]. Hrabie, J.A., Klose, J.R., Wink, D.A., et al. New nitric oxide-releasing zwitterions derived from polyamines. The Journal of Organic Chemistry 58, 1472-1476 (1993).
[2]. Keefer, L.K., Nims, R.W., Davies, K.M., et al. “NONOates” (1-substituted diazen-1-ium-1,2-diolates) as nitric oxide donors: Convenient nitric oxide dosage forms. Methods in Enzymology 268, 281-293 (1996).