Injector

Hi my name is Derrick and i own a 2001 Bmw E39 530 diesel. I am in the process of replacing the injectors but the number 3 injector is stuck. I have tried everything but cant get the injector out. Can anyone please give me advice as to how to get the injector out as i dont know what to do anymore. Please help as i am desperate to get my car running again.
 
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