ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C6H15N3/c1-7-4-8(2)6-9(3)5-7/h4-6H2,1-3H3/file?format=sdf&get3d=True  -- InChI=1S/C6H15N3/c1-7-4-8(2)6-9(3)5-7/h4-6H2,1-3H3 could not be loaded.