ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/2FH.Sn/h2%2A1H/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/2FH.Sn/h2%2A1H could not be loaded.