Convert FTP Lookup Address to FTP Address

If I open a tab via an entry in my FTP address book then the path returned via the TAB object looks like this.. ftp://SITE=MySite?:OPUS:ADDRESS:BOOK:LOOKUP://SomeFolder/TestFolder

Short of extracting the relevant information from the corresponding MySite entry in the ftp.oxc configuration file is there a simpler way of obtaining the path that is displayed in the address bar when I press F4 - e.g.

item.display_name might get you it (e.g. from any file or folder in the tab).