ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/CH3.ClH.Mg/h1H3%3B1H%3B/q%3B%3B%201/p-1/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/CH3.ClH.Mg/h1H3%3B1H%3B/q%3B%3B%201/p-1 could not be loaded.