ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C6H6O4/c7-2-4-1-5%288%296%289%293-10-4/h1%2C3%2C7%2C9H%2C2H2/file?format=sdf&get3d=True -- InChI%3DInChI%3D1S/C6H6O4/c7-2-4-1-5%288%296%289%293-10-4/h1%2C3%2C7%2C9H%2C2H2 could not be loaded.