ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C6H14N2/c1-4-8(5-2)6(3)7/h7H,4-5H2,1-3H3/file?format=sdf&get3d=True  -- InChI=1S/C6H14N2/c1-4-8(5-2)6(3)7/h7H,4-5H2,1-3H3 could not be loaded.