ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1%3DCC%3DC/2C%28%3DC1%29/C%3DC%5CC3%3DCC%3DCC%3DC3/C%3DC2/file?format=sdf&get3d=True -- C1%3DCC%3DC/2C%28%3DC1%29/C%3DC%5CC3%3DCC%3DCC%3DC3/C%3DC2 could not be loaded.