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