ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28O%29Cc2ccc1OCc3c%28C%28%5Cc1c2%29%3DC%5CCCN%28C%29C%29cccc3/file?format=sdf&get3d=True -- O%3DC%28O%29Cc2ccc1OCc3c%28C%28%5Cc1c2%29%3DC%5CCCN%28C%29C%29cccc3 could not be loaded.