ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C2H4O2/c3-1-2-4/h1%2C4H%2C2H2/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/C2H4O2/c3-1-2-4/h1%2C4H%2C2H2 could not be loaded.