ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C4H4Cl6/c5-1-3(7,8)4(9,10)2-6/h1-2H2/file?format=sdf&get3d=True  -- InChI=1S/C4H4Cl6/c5-1-3(7,8)4(9,10)2-6/h1-2H2 could not be loaded.