ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C4H12N2O/c5-1-2-6-3-4-7/h6-7H,1-5H2/file?format=sdf&get3d=True  -- InChI=1S/C4H12N2O/c5-1-2-6-3-4-7/h6-7H,1-5H2 could not be loaded.