(S)-2-Methyl-1-(6-nitropyridin-3-yl)piperazine

4-Butylresorcinol

Skin lightening agent intermediate

1-(6-Nitropyridin-3-yl)-4-nitrosopiperazine

nitrosamine impurity reference standard

Tert-butyl 4-(6-aminopyridin-3-yl)piperazine-1-carboxylate

pharmaceutical intermediate

Tert-butyl 4-(6-nitropyridin-3-yl)piperazine-1-carboxylate

Pharmaceutical intermediate

5-(4-methylpiperazin-1-yl)pyridin-2-amine

Pharmaceutical intermediate