144674-91-9 2-Pyridinecarboxamide, N,N'-1,4-butanediylbis(N-(3-(((1,6-dihydro-1-hydroxy-6-oxo-2-pyridinyl)carbonyl)amino)propyl)-1,6-dihydro-1-hydroxy-6-oxo-, tetrasodium salt 3,4,3-Lihopo N,N',N'',N'''-Tetra(1,2-dihydro-1-hydroxy-2-oxopyridine-6-carbonyl)-1,5,10,14-tetraazatetradecane