ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN%28C%29C1%3DCC2%3DC%28C%3DC1%29C%3DC3C%3DCC%28%3DCC3%3DN2%29N%28C%29C/file?format=sdf&get3d=True -- CN%28C%29C1%3DCC2%3DC%28C%3DC1%29C%3DC3C%3DCC%28%3DCC3%3DN2%29N%28C%29C could not be loaded.