ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/K.O2/c%3B1-2/q%201%3B/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/K.O2/c%3B1-2/q%201%3B could not be loaded.