1-(N-Ethoxycarbonylmethylpyridoxylidenium)-2-(2'-pyridyl)hydrazine 124076-31-9 Cgp 43902A Cgp-43902A L 2-9 L-2-9 L2-9 Pyridinium, 1-(2-ethoxy-2-oxoethyl)-3-hydroxy-5-(hydroxymethyl)-2-methyl-4-((2-pyridinylhydrazono)methyl)-, bromide