ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCN1C2%3DC%28C%3DC%28C%3DC2%29N%29C3%3DCC%3DCC%3DC31/file?format=sdf&get3d=True -- CCN1C2%3DC%28C%3DC%28C%3DC2%29N%29C3%3DCC%3DCC%3DC31 could not be loaded.