ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/H2N2O2/c3-1-2-4/h%28H%2C1%2C4%29%28H%2C2%2C3%29/p-2/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/H2N2O2/c3-1-2-4/h%28H%2C1%2C4%29%28H%2C2%2C3%29/p-2 could not be loaded.