ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1%28%3DC%28NC%28%3DO%29NC1%3DO%29C%28%3DO%29O%29F/file?format=sdf&get3d=True -- C1%28%3DC%28NC%28%3DO%29NC1%3DO%29C%28%3DO%29O%29F could not be loaded.