ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C4H10N2/c1-3-4(2)6(3)5/h3-4H,5H2,1-2H3/t3-,4+,6?/file?format=sdf&get3d=True  -- InChI=1S/C4H10N2/c1-3-4(2)6(3)5/h3-4H,5H2,1-2H3/t3-,4+,6? could not be loaded.