ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=S(=O)(=O)([O-])[O-].[Hg+].[Hg+]/file?format=sdf&get3d=True  -- InChI=S(=O)(=O)([O-])[O-].[Hg+].[Hg+] could not be loaded.