Аннотация:Reaction between the nitric oxide donor, tetranitrosyl iron complex with thiosulfate ligand (TNIC), and phosphoenolpyruvic acid (PEP) was studied. Formation of products of the reaction between PEP and TNIC was confirmed by UV-, IR-spectroscopy, and mass spectrometry methods. Also, ions with mass numbers m/z 318 and m/z 256 were identi-fied among the reaction products, belonging to the compounds [O3S2—Fe—PEP]2– and [S—Fe—PEP]2–, respectively.