ERROR opening https://cactus.nci.nih.gov/chemical/structure/1S/C3H4O/c1-2-3-4/h2-3H%2C1H2/file?format=sdf&get3d=True  -- 1S/C3H4O/c1-2-3-4/h2-3H%2C1H2 could not be loaded.