ERROR opening https://cactus.nci.nih.gov/chemical/structure/C/C%3DC/C1%3DCC%28%3DC%28C%3DC1%29O%29OC/file?format=sdf&get3d=True  -- C/C%3DC/C1%3DCC%28%3DC%28C%3DC1%29O%29OC could not be loaded.