ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C4H4O4.Fe/c5-3(6)1-2-4(7)8/file?format=sdf&get3d=True  -- InChI=1S/C4H4O4.Fe/c5-3(6)1-2-4(7)8 could not be loaded.