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ChEBI: S-nitroso-L-cysteine is an L-cysteine derivative in which the sulfur atom carries a nitroso substituent. A cell-permeable low-molecular-weight nitrosothiol and nitric oxide donor. It has a role as a vasodilator agent, a platelet aggregation inhibitor and a hematologic agent. It is a L-cysteine derivative and a nitrosothio compound.