pyridine-2-carboxaldehyde semicarbazone, 2-pyridinecarboxaldehyde semicarbazone, 2-(pyridin-2-ylmethylidene)hydrazinecarboxamide, 2-formylpyridine semicarbazone, 1-(2-Pyridinylmethylene)semicarbazide, pyridine-2-carboxyaldehyde semicarbazone, 2-Pyridinecarbaldehyde semicarbazone