ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1%28C%29%28N%29CC%28C%29%28C%29CC%28C%29%28C%29C1/file?format=sdf&get3d=True  -- C1%28C%29%28N%29CC%28C%29%28C%29CC%28C%29%28C%29C1 could not be loaded.