ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C3H3N2/c1-2-4-5-3-1/h1-3H/q-1/file?format=sdf&get3d=True  -- InChI=1S/C3H3N2/c1-2-4-5-3-1/h1-3H/q-1 could not be loaded.