ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DC%28C%28%3DNN1C%29C%29NCCNCC%28COC2%3DCC%3DCC%3DC2%29O/file?format=sdf&get3d=True  -- CC1%3DC%28C%28%3DNN1C%29C%29NCCNCC%28COC2%3DCC%3DCC%3DC2%29O could not be loaded.