ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C2H4O2/c1-2(3)4/h1H3,(H,3,4)/i1D3,2+1/hD/file?format=sdf&get3d=True  -- InChI=1S/C2H4O2/c1-2(3)4/h1H3,(H,3,4)/i1D3,2+1/hD could not be loaded.