ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C8H20N4/c1-8(11-3-2-9)12-6-4-10-5-7-12/h8,10-11H,2-7,9H2,1H3/file?format=sdf&get3d=True  -- InChI=1S/C8H20N4/c1-8(11-3-2-9)12-6-4-10-5-7-12/h8,10-11H,2-7,9H2,1H3 could not be loaded.