ERROR opening https://cactus.nci.nih.gov/chemical/structure/Cc1cc%28c%28c%28c1C%28%3DO%29OC%29O%29C%29O/file?format=sdf&get3d=True -- Cc1cc%28c%28c%28c1C%28%3DO%29OC%29O%29C%29O could not be loaded.