ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/2C6H12O7.Cu/c2%2A7-1-2%288%293%289%294%2810%295%2811%296%2812%2913/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/2C6H12O7.Cu/c2%2A7-1-2%288%293%289%294%2810%295%2811%296%2812%2913 could not be loaded.