ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DS%28C%28c1ccccc1%29c2ccccc2%29CC%28%3DO%29NO/file?format=sdf&get3d=True  -- O%3DS%28C%28c1ccccc1%29c2ccccc2%29CC%28%3DO%29NO could not be loaded.