Mercedes has been known to switch between ATF and Pentosin. Pentosin CHF 11s/Pentofluid 11 is the safe bet. If the car didn’t come with a tandem pump for power steering and hydraulic suspension, ATF might be OK.
And to make it more confusing, Mercedes also used a ZH-M fluid, if you had ABC or Magic Body Control and dealers would sell it as PSF.