ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C6H7N/c1-2-3-4-5-6-7/h1H,3-5H2/file?format=sdf&get3d=True  -- InChI=1S/C6H7N/c1-2-3-4-5-6-7/h1H,3-5H2 could not be loaded.