ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1%3DCC%3DC2C%28%3DC1%29NC3%3DCC%3DCC%3DC3/file?format=sdf&get3d=True  -- C1%3DCC%3DC2C%28%3DC1%29NC3%3DCC%3DCC%3DC3 could not be loaded.