ERROR opening https://cactus.nci.nih.gov/chemical/structure/OC1%3DCC%3DC%28C%28CCN%3DC3C%29%3DC3N2%29C2%3DC1/file?format=sdf&get3d=True  -- OC1%3DCC%3DC%28C%28CCN%3DC3C%29%3DC3N2%29C2%3DC1 could not be loaded.