ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1%3DCC%28%3DO%20C2%3DCC%28%3DCC%28%3DC21%29O%29O%29C3%3DCC%28%3DC%28C%28%3DC3%29O%29O%29O.Cl-/file?format=sdf&get3d=True -- C1%3DCC%28%3DO%20C2%3DCC%28%3DCC%28%3DC21%29O%29O%29C3%3DCC%28%3DC%28C%28%3DC3%29O%29O%29O.Cl- could not be loaded.