ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C6H15N3/c1-2-8-5-6-9-4-3-7-1/h7-9H,1-6H2/file?format=sdf&get3d=True  -- InChI=1S/C6H15N3/c1-2-8-5-6-9-4-3-7-1/h7-9H,1-6H2 could not be loaded.