ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28C%29%28C%29C%28%3DO%29Oc1cccc%28c1%29C%28CNC%29O/file?format=sdf&get3d=True  -- CC%28C%29%28C%29C%28%3DO%29Oc1cccc%28c1%29C%28CNC%29O could not be loaded.