ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/4C9H8O4.2Cu/c4%2A1-6%2810%2913-8-5-3-2-4-7%288%299%2811%2912/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/4C9H8O4.2Cu/c4%2A1-6%2810%2913-8-5-3-2-4-7%288%299%2811%2912 could not be loaded.