ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCC1%3DC%28C2%3DNC1%3DCC3%3DC%28C4%3DC%28C%28C%28%3DC5C%28%3DC%28C%28%3DCC6%3DNC%28%3DC2%29C%28%3DC6C%29C%3DC%29N-5%29C%29CCC%28%3DO%29O%29C4%3DN3%29C%28%3DO%29OC%29O-%29C%29C.Mg%202/file?format=sdf&get3d=True -- CCC1%3DC%28C2%3DNC1%3DCC3%3DC%28C4%3DC%28C%28C%28%3DC5C%28%3DC%28C%28%3DCC6%3DNC%28%3DC2%29C%28%3DC6C%29C%3DC%29N-5%29C%29CCC%28%3DO%29O%29C4%3DN3%29C%28%3DO%29OC%29O-%29C%29C.Mg%202 could not be loaded.