ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCC1%3DC%28C2%3DNC1%3DCC3%3DC%28C4%3DC%28/file?format=sdf&get3d=True  -- CCC1%3DC%28C2%3DNC1%3DCC3%3DC%28C4%3DC%28 could not be loaded.