ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C6H8O/c7-6-4-2-1-3-5-6/h2%2C4H%2C1%2C3%2C5H2/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/C6H8O/c7-6-4-2-1-3-5-6/h2%2C4H%2C1%2C3%2C5H2 could not be loaded.