2,2'-Dipyridyl ketone hydrazone 2-Pyridinecarboxaldehyde 2-pyridylhydrazone 2-Pyridinecarboxaldehyde, 2-pyridinylhydrazine 2-Pyridinecarboxaldehyde, 2-pyridinylhydrazone 2215-33-0 CP 49527 EINECS 218-678-3 NSC 91513 PAPHY Picolinaldehyde, 2-pyridylhydrazone (6CI,7CI,8CI) Pyridine-2-carbaldehyde-2-pyridylhydrazone