cuEDTA=Chem.MolFromMolFile('DisodiumCopperEDTA_v3000.mol') Draw.ShowMol(cuEDTA) CuEDTA rendered by RDkit Nice, Coordinate bonds are shown with dotted lines. 1 Chem.MolToMolFile(cuEDTA,'Testsave.mol',forceV3000=True) This also gives the right bond type in the Testsave molfile (M V30 ...