ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28Cc1ccc%28c%28c1%29O%29O%29%28C%28%3DO%29O%29NN/file?format=sdf&get3d=True  -- CC%28Cc1ccc%28c%28c1%29O%29O%29%28C%28%3DO%29O%29NN could not be loaded.