ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCOC1%3DCC2%3DC%28C%3DC1%29NC%3DC2CC%28C%29N/file?format=sdf&get3d=True  -- CCOC1%3DCC2%3DC%28C%3DC1%29NC%3DC2CC%28C%29N could not be loaded.