ERROR opening https://cactus.nci.nih.gov/chemical/structure/c12c%28C%28c3c%28cccc3%29Cl%29%3DNCc3n1c%28nn3%29C%29cc%28Cl%29cc2/file?format=sdf&get3d=True  -- c12c%28C%28c3c%28cccc3%29Cl%29%3DNCc3n1c%28nn3%29C%29cc%28Cl%29cc2 could not be loaded.