ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%26%2361%3B1S/C2H4O2/c1-4-2-3/h2H%2C1H3/file?format=sdf&get3d=True  -- InChI%3DInChI%26%2361%3B1S/C2H4O2/c1-4-2-3/h2H%2C1H3 could not be loaded.