ERROR opening https://cactus.nci.nih.gov/chemical/structure/Nc1cc%28N%29ccc1%2C%20c1cc%28cc%28c1%29N%29N/file?format=sdf&get3d=True  -- Nc1cc%28N%29ccc1%2C%20c1cc%28cc%28c1%29N%29N could not be loaded.