ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C2H6O2/c3-1-2-4/h3-4H,1-2H2/file?format=sdf&get3d=True  -- InChI=1S/C2H6O2/c3-1-2-4/h3-4H,1-2H2 could not be loaded.