ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C6H9NO/c1-5%288%296-3-2-4-7-6/h2-4H2%2C1H3/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/C6H9NO/c1-5%288%296-3-2-4-7-6/h2-4H2%2C1H3 could not be loaded.