ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/Mo.Ni.4O/q%2B6%3B%2B2%3B4%2A-2/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/Mo.Ni.4O/q%2B6%3B%2B2%3B4%2A-2 could not be loaded.