ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C6H4O2/c7-5-1-2-6%288%294-3-5/h1-4H/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/C6H4O2/c7-5-1-2-6%288%294-3-5/h1-4H could not be loaded.