ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1%28%3DCC%3DCC%3DC1%29C%28C%29C%28C%29N/file?format=sdf&get3d=True  -- C1%28%3DCC%3DCC%3DC1%29C%28C%29C%28C%29N could not be loaded.