ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1%5CC%3DC2%5CC%3DC/Cc3ccc4cc5ccccc5c1c4c23/file?format=sdf&get3d=True  -- C1%5CC%3DC2%5CC%3DC/Cc3ccc4cc5ccccc5c1c4c23 could not be loaded.