ERROR opening https://cactus.nci.nih.gov/chemical/structure/OC%28C%28%3DO%29O%29c1ccc%28O%29c%28O%29c1/file?format=sdf&get3d=True  -- OC%28C%28%3DO%29O%29c1ccc%28O%29c%28O%29c1 could not be loaded.