α,α''-[[[2-(3,4-Dimethoxyphenyl)ethyl]imino]di-3,1-propanediyl]bis[3,4-dimethoxy-α-(1-methylethyl)-benzeneacetonitrile is an impurity of Verapamil (V125000) which is a calcium channel blocker. Antihypertensive; antianginal; antiarrhythmic (class IV).