ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C7H6O4/c8-6-3-4-5%2811-6%291-2-10-7%284%299/h1%2C3%2C7%2C9H%2C2H2/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/C7H6O4/c8-6-3-4-5%2811-6%291-2-10-7%284%299/h1%2C3%2C7%2C9H%2C2H2 could not be loaded.