ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCC%28C%28C1%3DCC2%3DC%28C%3DC1%29C%3DCC%3DC2%29%3DO%29N3CCCC3/file?format=sdf&get3d=True  -- CCCC%28C%28C1%3DCC2%3DC%28C%3DC1%29C%3DCC%3DC2%29%3DO%29N3CCCC3 could not be loaded.