ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28%3DO%29CC%28C%5C1%3DC%28/O%29c2ccccc2OC/1%3DO%29c3ccccc3/file?format=sdf&get3d=True  -- CC%28%3DO%29CC%28C%5C1%3DC%28/O%29c2ccccc2OC/1%3DO%29c3ccccc3 could not be loaded.