ERROR opening https://cactus.nci.nih.gov/chemical/structure/Oc1ccc%28cc1%29C2CC%28%3DO%29c3c%28O%29c%28C%29c%28O%29cc3O2/file?format=sdf&get3d=True  -- Oc1ccc%28cc1%29C2CC%28%3DO%29c3c%28O%29c%28C%29c%28O%29cc3O2 could not be loaded.