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