ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C3H3N3/c1-4-2-6-3-5-1/h1-3H/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/C3H3N3/c1-4-2-6-3-5-1/h1-3H could not be loaded.