A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 138-60-3, Name is 4-Oxo-1,4-dihydropyridine-2,6-dicarboxylic acid, molecular formula is C7H5NO5. In an article, author is Do Thi Trang,once mentioned of 138-60-3, Safety of 4-Oxo-1,4-dihydropyridine-2,6-dicarboxylic acid.
Chemical Constituents of the Marine Sponge Aaptos aaptos (Schmidt, 1864) and Their Cytotoxic Activity
Seven compounds (1-7) were isolated from the marine sponge Aaptos aaptos living in the Vietnamese sea. Their structures were determined as 2 hours, 5H,7H,9H-9S-hydroxy-imidazo[1,5-a]pyridine-1,3-dione (1), 3-([9-methylhexadecyl]oxy)propane-1,2-diol 2, 2,3-dihydro-2,3-dioxoaaptamine (3), indol-3-aldehyde (4), methyl indole-3-carboxylate (5) 4-hydroxy-5-(indole-3-yI)-5-oxo-pen tan-2-one (6), and thymidine (7) by extensive analysis of HR-ESI-MS, 1D, and 2D NMR spectral data, as well as by comparison of the spectral data with those reported in the literature. In addition, the absolute configuration of 1 was determined from the experimental ECD spectrum and comparison of this with the theoretical ECD calculations using the TDDFT method. Compounds 1 and 2 were isolated from nature for the first time. Compound 3 induced cytotoxic activity against SK-LU)-1, MCF-7, HepG2, and SK-Mel-2 cell lines with IC50 values of 41.27 +/- 2.63, 40.70 +/- 2.65, 34.31 +/- 3.43, and 36.63 +/- 1.40 mu M, respectively.
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Reference:
Pyridine – Wikipedia,
,Pyridine | C5H5N – PubChem