ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C18H12O4/c19-15-13%2811-7-3-1-4-8-11%2916%2820%2918%2822%2914%2817%2815%2921%2912-9-5-2-6-10-12/h1-10%2C19%2C22H/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/C18H12O4/c19-15-13%2811-7-3-1-4-8-11%2916%2820%2918%2822%2914%2817%2815%2921%2912-9-5-2-6-10-12/h1-10%2C19%2C22H could not be loaded.