Mirtazapine Carbonitrile IMpurity

1-(3-Cyanopyridyl-2)-2-Phenyl-4-Methylpyperazine

1-(3-Cyano-2-pyridyl)-4-Methyl-2-phenylpiperazine

2-(4-Methyl-2-phenylpiperazin-1-yl)-3-cyanopyridine

2-(4-Methyl-2-phenylpiperazin-1-yl)pyridine-3-carbonitrile