ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C5H10N2O/c1-6-3-4-7%282%295%286%298/h3-4H2%2C1-2H3/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/C5H10N2O/c1-6-3-4-7%282%295%286%298/h3-4H2%2C1-2H3 could not be loaded.