ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1C2%3DC%28C%3DCC%28%3DC2Cl%29Cl%29NC3%3DNC%28%3DO%29CN31/file?format=sdf&get3d=True -- C1C2%3DC%28C%3DCC%28%3DC2Cl%29Cl%29NC3%3DNC%28%3DO%29CN31 could not be loaded.