ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/CH4N2O.CH2O/c2-1%283%294/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/CH4N2O.CH2O/c2-1%283%294 could not be loaded.