D 2356 (OTTO) 2,2'-Dithiobis(5-nitropyridine), 96% Cas 2127-10-8 - used in the study of the NMR of G protein-coupled receptors as a cysteine-activating reagent. D 2356 (OTTO) 2,2'-Dithiobis(5-nitropyridine), 96% Cas 2127-10-8 - used in deprotection assays of protected selenocysteine-containing peptides to deprotect and remove p-methoxybenzyl groups and acetamidomethyl groups from the side-chains of cysteine and selenocysteine.