ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C6H9N/c1-4-7(5-2)6-3/h4-6H,1-3H2/file?format=sdf&get3d=True  -- InChI=1S/C6H9N/c1-4-7(5-2)6-3/h4-6H,1-3H2 could not be loaded.