ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C7H4N2O7/c10-6-4%287%2811%2912%291-3%288%2813%2914%292-5%286%299%2815%2916/h1-2%2C10H%2C%28H%2C11%2C12%29/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/C7H4N2O7/c10-6-4%287%2811%2912%291-3%288%2813%2914%292-5%286%299%2815%2916/h1-2%2C10H%2C%28H%2C11%2C12%29 could not be loaded.