ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DS%28%3DO%29%28N%28CCC%29CCC%29c1ccc%28C%28%3DO%29O%29cc1/file?format=sdf&get3d=True  -- O%3DS%28%3DO%29%28N%28CCC%29CCC%29c1ccc%28C%28%3DO%29O%29cc1 could not be loaded.