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