ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCCOCCOC%28%3DO%29C1%3DCC%3DCC%3DC1C%28%3DO%29OCCOCCCC/file?format=sdf&get3d=True  -- CCCCOCCOC%28%3DO%29C1%3DCC%3DCC%3DC1C%28%3DO%29OCCOCCCC could not be loaded.