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