ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C6H12N2O/c1-7-4-3-5-8%282%296%287%299/h3-5H2%2C1-2H3/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/C6H12N2O/c1-7-4-3-5-8%282%296%287%299/h3-5H2%2C1-2H3 could not be loaded.