ERROR opening https://cactus.nci.nih.gov/chemical/structure/Nc3nc%28C%28C%29C%29cc%28n3%29-c%28cc2%29c1ccccc1c2F/file?format=sdf&get3d=True  -- Nc3nc%28C%28C%29C%29cc%28n3%29-c%28cc2%29c1ccccc1c2F could not be loaded.