ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28CCCCCCNC1C2%3DC%28CCC3%3DC1C%3DCC%3DC3%29C%3DCC%3DC2%29O/file?format=sdf&get3d=True  -- O%3DC%28CCCCCCNC1C2%3DC%28CCC3%3DC1C%3DCC%3DC3%29C%3DCC%3DC2%29O could not be loaded.