ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1nc2c%28n1CCOCP%28%3DO%29%28O%29O%29%5BnH%5Dc%28nc2%3DO%29N/file?format=sdf&get3d=True  -- c1nc2c%28n1CCOCP%28%3DO%29%28O%29O%29%5BnH%5Dc%28nc2%3DO%29N could not be loaded.