ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C6H12/c1-5-6(2,3)4/h5H,1H2,2-4H3/file?format=sdf&get3d=True  -- InChI=1S/C6H12/c1-5-6(2,3)4/h5H,1H2,2-4H3 could not be loaded.