ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C4H8N2O3/c5-1-3%287%296-2-4%288%299/h1-2%2C5H2%2C%28H%2C6%2C7%29%28H%2C8%2C9%29/file?format=sdf&get3d=True -- InChI%3DInChI%3D1S/C4H8N2O3/c5-1-3%287%296-2-4%288%299/h1-2%2C5H2%2C%28H%2C6%2C7%29%28H%2C8%2C9%29 could not be loaded.