ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCC%28C%29C1%3DCC%28%3DCC%28%3DC1O%29N%20%28%3DO%29O-%29N%20%28%3DO%29O-/file?format=sdf&get3d=True  -- CCC%28C%29C1%3DCC%28%3DCC%28%3DC1O%29N%20%28%3DO%29O-%29N%20%28%3DO%29O- could not be loaded.