ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC2C%28%3DC2%5Cc1ccccc1%29%5Cc3ccccc3/file?format=sdf&get3d=True  -- O%3DC2C%28%3DC2%5Cc1ccccc1%29%5Cc3ccccc3 could not be loaded.