At least two files have Python syntax errors

[cclauss]

$ flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics

./contributed/web/imolecule/server.py:40:15: E999 SyntaxError: invalid syntax
        async = self.pool.apply_async(_worker_process, [json_rpc])
              ^
./contributed/c++/fragments/removedups.py:31:11: E999 SyntaxError: invalid syntax
    smarts = [SMILEStoSMARTS(name) for name in unames]
          ^
2     E999 SyntaxError: invalid syntax
2