ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%26%2361%3B1S/H12Si6/c1-2-4-6-5-3-1/h1-6H2/file?format=sdf&get3d=True  -- InChI%3DInChI%26%2361%3B1S/H12Si6/c1-2-4-6-5-3-1/h1-6H2 could not be loaded.