Parse help with res:ShipmentResponse as element

My response is xml and looks something like this:

<res:ShipmentResponse xmlns:res=‘xxxxxx’>


2022-07-20T13:32:58.845+00:00
07ca1454e7e34da0a7b973defd6dddec
xxxx


</res:ShipmentResponse>

I want to parse to get SiteID.

I tried this:

var jsonObject = xml2Json(responseBody.Body);
console.log(jsonObject);

console.log(jsonObject.ShipmentRequest.Response.ServiceHeader.SiteID): → wanted this
console.log(jsonObject.ShipmentRequest); → this give object undefined because of “res”
console.log(jsonObject.res:ShipmentRequest); → this has syntax error

How do I write “res:ShipmentRequest” so that it works?