ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCN%20%28C%29%28C%29C1%3DCC%28%3DCC%3DC1%29O/file?format=sdf&get3d=True  -- CCN%20%28C%29%28C%29C1%3DCC%28%3DCC%3DC1%29O could not be loaded.