ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C4H8N2O3/c5-3%287%291-6-2-4%288%299/h6H%2C1-2H2%2C%28H2%2C5%2C7%29%28H%2C8%2C9%29/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/C4H8N2O3/c5-3%287%291-6-2-4%288%299/h6H%2C1-2H2%2C%28H2%2C5%2C7%29%28H%2C8%2C9%29 could not be loaded.