Verapamil-d6 Hydrochloride (a-[3-[[2-(3,4-Dimethoxyphenyl)ethyl]methylamino]propyl]-3,4-dimethoxy-a-(1-methylethyl)-benzeneacetonitrile-d6 Hydrochloride, Berkatens-d6, Calan-d6, Cardibeltin-d6, Dignover-d6, Isoptin-d6, Veracim-d6, Veramex-d6, Zolvera-d6)