Camshaft pulley replacement

[600 benz]

I’m replacing a water pump on my 07 cl600 v12 got all but one bolt left which is behind the camshaft pulley anyone know how to get the pulley off does it take a special tool or has anybody else ever done work on this same vehicle and parts ?

 

[600 benz]

I’m changing my water pump on my cl600 got all but one bolt out that’s because it’s behind camshaft pulley but I can’t get pulley off anyone have any suggestions for me on how to take camshaft pulley off ? Do I need a special tool or no ?