ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1/C4H9N3O2/c1-8-4(9-2)3-6-7-5/h4H,3H2,1-2H3/file?format=sdf&get3d=True  -- InChI=1/C4H9N3O2/c1-8-4(9-2)3-6-7-5/h4H,3H2,1-2H3 could not be loaded.