ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DCC2%3DC%28C%3DC1%29N3CC4%3DC%28C%3DCC%28%3DC4%29C%29N%28C2%29C3/file?format=sdf&get3d=True -- CC1%3DCC2%3DC%28C%3DC1%29N3CC4%3DC%28C%3DCC%28%3DC4%29C%29N%28C2%29C3 could not be loaded.