interface BancorConverter {
    // _path is actually IERC20Token[] type
    function quickConvert(address[] _path, uint256 _amount, uint256 _minReturn) public payable returns (uint256);
}
function quickConvert(address[] _path, uint256 _amount, uint256 _minReturn) public payable returns (uint256);

// _path is actually IERC20Token[] type