ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1CNCC%28C2%3DCC%28%3DC%28C%3DC21%29O%29O%29C3%3DCC%3DCC%3DC3/file?format=sdf&get3d=True  -- C1CNCC%28C2%3DCC%28%3DC%28C%3DC21%29O%29O%29C3%3DCC%3DCC%3DC3 could not be loaded.