    function initialize(address _bntConverter, address _tokenConverter, address _ethToken, address _bntToken, address _token) external onlyOwner {
       bntConverter = IBancorConverter(_bntConverter);
       tokenConverter = IBancorConverter(_tokenConverter);
       ethToken = _ethToken;
       bntToken = _bntToken;
       token = _token;
       emit Initialized(_bntConverter, _tokenConverter, _ethToken, _bntToken, _token);
    }