ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCCn1cc%5Bn%2B%5D%28c1%29C.F%5BP-%5D%28F%29%28F%29%28F%29%28F%29F/file?format=sdf&get3d=True  -- CCCCn1cc%5Bn%2B%5D%28c1%29C.F%5BP-%5D%28F%29%28F%29%28F%29%28F%29F could not be loaded.