ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC1c2ccccc2C%28%3DO%29N1C3CCC%28%3DO%29NC3%3DO/file?format=sdf&get3d=True  -- O%3DC1c2ccccc2C%28%3DO%29N1C3CCC%28%3DO%29NC3%3DO could not be loaded.