Looking for the odata query that returns the Sharepoint Site URL for a document location for an account

Hi,

For a given account I need to find the URL of the SharePoint Site.

I can get the sharepoint document location, but I really need the URL of the "parent"- Sharepoint Site.

I have come this far:

https://NOTMYORG.crm4.dynamics.com/XRMServices/2011/OrganizationData.svc/SharePointDocumentLocationSet?$expand=sharepointdocumentlocation_parent_sharepointsite&$select=Name,sharepointdocumentlocation_parent_sharepointsite&$filter=RegardingObjectId/Id eq (guid'{0537BE88-ECFB-E311-A8DE-2C59E5419D10}')

But now I am stuck...So any tip is welcome, thanks!