ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCN%28C%29C%28C%29C%3DC%28C1%3DCC%3DCS1%29C2%3DCC%3DCS2/file?format=sdf&get3d=True  -- CCN%28C%29C%28C%29C%3DC%28C1%3DCC%3DCS1%29C2%3DCC%3DCS2 could not be loaded.