ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC5c2cccc1ccc4c%28c12%29c3c5cccc3cc4/file?format=sdf&get3d=True  -- O%3DC5c2cccc1ccc4c%28c12%29c3c5cccc3cc4 could not be loaded.