ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1%28%3DCC2%3DC%28C%3DC1CC%28C%29NC%29OCO2%29C/file?format=sdf&get3d=True  -- C1%28%3DCC2%3DC%28C%3DC1CC%28C%29NC%29OCO2%29C could not be loaded.