ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C6H11N/c1-3-5-7-6-4-2/h3-4,7H,1-2,5-6H2/file?format=sdf&get3d=True  -- InChI=1S/C6H11N/c1-3-5-7-6-4-2/h3-4,7H,1-2,5-6H2 could not be loaded.