ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C6H7N/c1-6-2-4-7-5-3-6/h2-5H,1H3/file?format=sdf&get3d=True  -- InChI=1S/C6H7N/c1-6-2-4-7-5-3-6/h2-5H,1H3 could not be loaded.