L-Cysteine S-sulfate sodium hydrate is a potent N-methyl-d-aspartate (NMDA) glutamatergic receptors agonist. L-Cysteine S-sulfate sodium hydrate is the substrate for cystine lyase, it can be used in mass spectrometry operations[1][2].
[1]. Steventon GB, et, al. Comparison of the sulfur-oxygenation of cysteine and S-carboxymethyl-l-cysteine in human hepatic cytosol and the rÔle of cysteine dioxygenase. J Pharm Pharmacol. 2018 Aug;70(8):1069-1077.
[2]. Macaluso V, et al. l-Cysteine Modified by S-Sulfation: Consequence on Fragmentation Processes Elucidated by Tandem Mass Spectrometry and Chemical Dynamics Simulations. J Phys Chem A. 2019 May 2;123(17):3685-3696.