ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC1c3c%28N%28%5CN%3DC1%5CC%28%3DO%29O%29CC%29cc2OCOc2c3/file?format=sdf&get3d=True  -- O%3DC1c3c%28N%28%5CN%3DC1%5CC%28%3DO%29O%29CC%29cc2OCOc2c3 could not be loaded.