Mercedes Benz antifreeze/coolant is an Ethylene Glycol base containing Glysantin G 05 as a corrosion inhibitor.
As far as I understand, Glysantin G 05 is an organic acid corrosion inhibitor, and was the first of it's kind. All other antifreeze/coolant manufacturers are now making product containing similar organic acid corrosion inhibitors.
As far as a MSDS (Material Safety Data Sheet), you will need to contact Valvoline, not Mercedes, as Mercedes does not manufacture their branded antifreeze/coolant. I tried retrieving a MSDS from Ashland's online MSDS, and there were no results for any type of anrifreeze/coolant.
The best I could do was to go to:
http://www.valvoline.com/index_products.html then choose product category, "Cooling Systems Products", then click on the "Technical Bulletin" button.