Back to the overview of different vitamins When you can not open the PDB files you probably have not the free plug-in Chime. You can download Chime, after registration, free of charge by clicking here. Vitamine B12 Chemische naam: (Cyano)cobalamine (engels: Cobalamin) Molecuul formule: C63H88CoN14O14P Traditionele structuurformule. 3D-ball & stick structuurformule. De PDB file getoont met Chime.