ERROR opening https://cactus.nci.nih.gov/chemical/structure/ClC1%3DCC%3DC%28C%3DC1%29C%28%3DO%29NCCN1CCOCC1/file?format=sdf&get3d=True  -- ClC1%3DCC%3DC%28C%3DC1%29C%28%3DO%29NCCN1CCOCC1 could not be loaded.