ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC/2Oc1cc%28OC%29cc%28OC%29c1%5CC%3DC%5C2/file?format=sdf&get3d=True  -- O%3DC/2Oc1cc%28OC%29cc%28OC%29c1%5CC%3DC%5C2 could not be loaded.