barre code for rover 75 used remote

[starprog]

hello!
I want to added second used remote for rover 75 year 2000, for that I need the barre code, from where getting it?
this car have immobox ews3
Rover 75 2 button remote key fob Valeo 73370847C tested (207) | eBay (http://www.ebay.co.uk/itm/Rover-75-2-button-remote-key-fob-Valeo-73370847C-tested-207-/390361841702?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item5ae3610026)

[dontzapit]

hello!
I want to added second used remote for rover 75 year 2000, for that I need the barre code, from where getting it?
this car have immobox ews3
Rover 75 2 button remote key fob Valeo 73370847C tested (207) | eBay (http://www.ebay.co.uk/itm/Rover-75-2-button-remote-key-fob-Valeo-73370847C-tested-207-/390361841702?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item5ae3610026)

there is a sticker inside the key with a number on it, if you know the algo then you can calculate it, if you dont then your basically screwed and need a new key with bar code

[starprog]

IT HAVE INSIDE NUMBER:252628

[starprog]

any one can calc me barre code?