ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C2H2O2/c3-2-1-4-2/h1H2/file?format=sdf&get3d=True  -- InChI=1S/C2H2O2/c3-2-1-4-2/h1H2 could not be loaded.