ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/3C3H7NS2.Fe/c3%2A1-4%282%293%285%296/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/3C3H7NS2.Fe/c3%2A1-4%282%293%285%296 could not be loaded.