ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1/CH5N3/c2-1(3)4/h(H5,2,3,4)/f/h2H,3-4H2/file?format=sdf&get3d=True  -- InChI=1/CH5N3/c2-1(3)4/h(H5,2,3,4)/f/h2H,3-4H2 could not be loaded.