ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C5H6N4O4/c1-12-4(10)3-6-7-8-9(3)5(11)13-2/h1-2H3/file?format=sdf&get3d=True  -- InChI=1S/C5H6N4O4/c1-12-4(10)3-6-7-8-9(3)5(11)13-2/h1-2H3 could not be loaded.