2-Formylpyridine thiosemicarbazone

2-Pyridylmethanonethiosemicarbazone

1-(2-Pyridylmethylene)thiosemicarbazide

1-(Pyridine-2-ylmethylene)thiosemicarbazide

Amino α-[2-(2-pyridylmethylene)hydrazono]methanethiol

2-[[2-[Amino(mercapto)methylene]hydrazono]methyl]pyridine