ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C7H10N2/c8-6-4-2-1-3-5-7-9/h1-5H2/file?format=sdf&get3d=True  -- InChI=1S/C7H10N2/c8-6-4-2-1-3-5-7-9/h1-5H2 could not be loaded.