ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C4H8N2O3/c5-2%284%288%299%291-3%286%297/h2H%2C1%2C5H2%2C%28H2%2C6%2C7%29%28H%2C8%2C9%29/file?format=sdf&get3d=True -- InChI%3DInChI%3D1S/C4H8N2O3/c5-2%284%288%299%291-3%286%297/h2H%2C1%2C5H2%2C%28H2%2C6%2C7%29%28H%2C8%2C9%29 could not be loaded.