ERROR opening https://cactus.nci.nih.gov/chemical/structure/OCC2CN%28c1cccc%28C%29c1%29C%28%3DO%29O2/file?format=sdf&get3d=True  -- OCC2CN%28c1cccc%28C%29c1%29C%28%3DO%29O2 could not be loaded.