ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1%3DCC%3DC%28C%3DC1%29CSCC2%3DCC%3DCC%3DC2/file?format=sdf&get3d=True  -- C1%3DCC%3DC%28C%3DC1%29CSCC2%3DCC%3DCC%3DC2 could not be loaded.