ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCN%28CCc1c%5BnH%5Dc2c1cc%28OC%29cc2%29C/file?format=sdf&get3d=True  -- CCN%28CCc1c%5BnH%5Dc2c1cc%28OC%29cc2%29C could not be loaded.