ERROR opening https://cactus.nci.nih.gov/chemical/structure/n1c%28nc%28nc1N%28C%29C%29N%28C%29C%29N%28C%29C/file?format=sdf&get3d=True  -- n1c%28nc%28nc1N%28C%29C%29N%28C%29C%29N%28C%29C could not be loaded.