ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN%28C%28C%29%3DCC2%3DO%29%20N2C1%3DCC%3DCC%3DC1/file?format=sdf&get3d=True  -- CN%28C%28C%29%3DCC2%3DO%29%20N2C1%3DCC%3DCC%3DC1 could not be loaded.