ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C6H8O2.Na/c1-2-3-4-5-6%287%298/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/C6H8O2.Na/c1-2-3-4-5-6%287%298 could not be loaded.