ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C4H6N4O2/c5-2-1(9)3(10)8-4(6)7-2/h2H,5H2,(H3,6,7,8,10)/file?format=sdf&get3d=True  -- InChI=1S/C4H6N4O2/c5-2-1(9)3(10)8-4(6)7-2/h2H,5H2,(H3,6,7,8,10) could not be loaded.