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