ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1%3DCC%3DC%28C%3DC1%29NC%28%3DO%29NC2%3DCC%28%3DNC%3DC2%29Cl/file?format=sdf&get3d=True  -- C1%3DCC%3DC%28C%3DC1%29NC%28%3DO%29NC2%3DCC%28%3DNC%3DC2%29Cl could not be loaded.