ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN%28C%29c1ccc2c%28c1%29sc-3cc%28%3DN%2B%28C%29C%29ccc3n2.Cl-/file?format=sdf&get3d=True  -- CN%28C%29c1ccc2c%28c1%29sc-3cc%28%3DN%2B%28C%29C%29ccc3n2.Cl- could not be loaded.