ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DCC2%3DC%28N1C%29N%3DC%28N%3DC2N3CCCC3%29N4CCCC4/file?format=sdf&get3d=True  -- CC1%3DCC2%3DC%28N1C%29N%3DC%28N%3DC2N3CCCC3%29N4CCCC4 could not be loaded.