ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1ccccc1C%28%3DO%29OC%28%3DO%29c2ccccc2/file?format=sdf&get3d=True  -- c1ccccc1C%28%3DO%29OC%28%3DO%29c2ccccc2 could not be loaded.