ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1c%28cc%28c2c1C%28%3DO%29c3cc%28cc%28c3C2%3DO%29O%29O%29O%29CO/file?format=sdf&get3d=True  -- c1c%28cc%28c2c1C%28%3DO%29c3cc%28cc%28c3C2%3DO%29O%29O%29O%29CO could not be loaded.