for the following products
2-[[4-(2-Pyridinyl)phenyl]methyl]-hydrazinecarboxylic acid 1,1-dimethylethyl ester | Hydrazinecarboxylic acid ,2-[[4-(2-pyridinyl)phenyl]methyl]-,1,1-dimethylethyl ester | tert-Butyl 2-(4-(pyridin-2-yl)benzyl)hydrazine carboxylate and 1-Boc-2-[4-(2-Pyridinyl)benzylidene]hydrazine
