ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C6H14N2/c1-7-3-5-8(2)6-4-7/h3-6H2,1-2H3/file?format=sdf&get3d=True  -- InChI=1S/C6H14N2/c1-7-3-5-8(2)6-4-7/h3-6H2,1-2H3 could not be loaded.