ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1C2%3DC%28C%3DCC%28%3DC2CN1N%3DC%28N%29N%29Cl%29Cl/file?format=sdf&get3d=True -- C1C2%3DC%28C%3DCC%28%3DC2CN1N%3DC%28N%29N%29Cl%29Cl could not be loaded.