ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC1c3c%28O/C%28%3DC1/O%29c2ccccc2%29cccc3/file?format=sdf&get3d=True  -- O%3DC1c3c%28O/C%28%3DC1/O%29c2ccccc2%29cccc3 could not be loaded.