ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C7H6N2/c1-2-4-7-6(3-1)8-5-9-7/h1-6H/file?format=sdf&get3d=True  -- InChI=1S/C7H6N2/c1-2-4-7-6(3-1)8-5-9-7/h1-6H could not be loaded.