DAA (1,2-Diaminoanthraquinone) reacts with nitric oxide (NO) to form a red (λ Em 580 nm) fluorescent precipitate. DAA has been used to detect NO concentration in rat retinas after injury to the optic nerve. Yellow orange solid soluble in DMSO Store desiccated at -20°C C14H12N2O6S MW: 336.32