ERROR opening https://cactus.nci.nih.gov/chemical/structure/C%3D1C%3DC2C%3DCC1CCC3%3DCC%3DC%28C%3DC3%29CC2/file?format=sdf&get3d=True  -- C%3D1C%3DC2C%3DCC1CCC3%3DCC%3DC%28C%3DC3%29CC2 could not be loaded.