ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C6H8O4/c1-3-5(7)10-4(2)6(8)9-3/h3-4H,1-2H3/file?format=sdf&get3d=True  -- InChI=1S/C6H8O4/c1-3-5(7)10-4(2)6(8)9-3/h3-4H,1-2H3 could not be loaded.