You will be out of immigration/customs at around 3-3:30 pm ; give it an hour on average to the city(on taxi or express bus;1.5hrs for the subway). You will have to take back transportation at 5-5:30pm in order to be 2 hours before your next flight.
After all , you will have half an hour to an hour in the city, which is not enough for any sightseeing.
You will be out of