ERROR opening https://cactus.nci.nih.gov/chemical/structure/OC1%3DCC%3DCC%28C2%28CCCCN%28C2%29C%29CC%29%3DC1/file?format=sdf&get3d=True  -- OC1%3DCC%3DCC%28C2%28CCCCN%28C2%29C%29CC%29%3DC1 could not be loaded.