ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/H2N2O2/c3-1-2-4/h(H,1,4)(H,2,3)/p-2/file?format=sdf&get3d=True  -- InChI=1S/H2N2O2/c3-1-2-4/h(H,1,4)(H,2,3)/p-2 could not be loaded.