ERROR opening https://cactus.nci.nih.gov/chemical/structure/N2%3DC1C%28C%3DCC%3DC1%29%3DC4C2%3DCc3ccccc3N4C/file?format=sdf&get3d=True  -- N2%3DC1C%28C%3DCC%3DC1%29%3DC4C2%3DCc3ccccc3N4C could not be loaded.