ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1%3DCC%3DC%28C%3DC1%29NC%28NC2%3DCN%3DNS2%29%3DO/file?format=sdf&get3d=True  -- C1%3DCC%3DC%28C%3DC1%29NC%28NC2%3DCN%3DNS2%29%3DO could not be loaded.