ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC/C%3DC/C/C%3DC/CC1C%28O1%29/C%3DC/C%28C/C%3DC/CCCC%28%3DO%29O%29O/file?format=sdf&get3d=True -- CC/C%3DC/C/C%3DC/CC1C%28O1%29/C%3DC/C%28C/C%3DC/CCCC%28%3DO%29O%29O could not be loaded.