1-(2-Methyl-isonicotinyl)-2-vanillyliden-hydrazin [German] 2-Methylisonicotinic acid vanillylidenehydrazide 4-Pyridinecarboxylic acid, 2-methyl-, ((4-hydroxy-3-methoxyphenyl)methylene)hydrazide Isonicotinic acid, 2-methyl-, vanillylidenehydrazide NS2066400