ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28%3DO%29O.CC%28%3DO%29O.O%3D%5BU%5D%3DO/file?format=sdf&get3d=True  -- CC%28%3DO%29O.CC%28%3DO%29O.O%3D%5BU%5D%3DO could not be loaded.