ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1%3DCC%3DC%28C%3DC1%29C2%3DNC%28%3DCC%28%3DN2%29Cl%29Cl/file?format=sdf&get3d=True  -- C1%3DCC%3DC%28C%3DC1%29C2%3DNC%28%3DCC%28%3DN2%29Cl%29Cl could not be loaded.