ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C6H12O2/c1-5(7)4-6(2,3)8/h8H,4H2,1-3H3/file?format=sdf&get3d=True  -- InChI=1S/C6H12O2/c1-5(7)4-6(2,3)8/h8H,4H2,1-3H3 could not be loaded.