ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1ccc%28cc1%29C%28%3DC%28c2ccccc2%29c3ccccc3%29c4ccccc4/file?format=sdf&get3d=True  -- c1ccc%28cc1%29C%28%3DC%28c2ccccc2%29c3ccccc3%29c4ccccc4 could not be loaded.