ERROR opening https://cactus.nci.nih.gov/chemical/structure/C%5BC%40%5D31CCC2CC3/C%3DC%5CCC1%28O%29C2%28C%29C/file?format=sdf&get3d=True  -- C%5BC%40%5D31CCC2CC3/C%3DC%5CCC1%28O%29C2%28C%29C could not be loaded.