That's pretty much in the centre, S-Bahn 'Donnersbergerbruecke' is just next to it. Take any train in direction Hauptbahnhof and change at Marienplatz into U6 (downstairs) in direction Garching/Forschungszentrum.
Guestimate is a 40min ride - and likely a very crowded train.

If you like to buy tickets (or an app) in advance: http://www.mvv-muenchen.de/en/homepage/index.html