ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1ccc%28cc1%29c2cc%28%3DO%29c3ccc%28c%28c3o2%29O%29O/file?format=sdf&get3d=True  -- c1ccc%28cc1%29c2cc%28%3DO%29c3ccc%28c%28c3o2%29O%29O could not be loaded.