ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/CH4N2O.H2O2/c2-1(3)4;1-2/h(H4,2,3,4);1-2H/file?format=sdf&get3d=True  -- InChI=1S/CH4N2O.H2O2/c2-1(3)4;1-2/h(H4,2,3,4);1-2H could not be loaded.