ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/CH3N3O2/c2-1(5)3-4-6/h(H3,2,3,5,6)/file?format=sdf&get3d=True  -- InChI=1S/CH3N3O2/c2-1(5)3-4-6/h(H3,2,3,5,6) could not be loaded.