Is 5 hours enough transit time at PEK?

Hello. On the 8th of September I will be flying from Amsterdam to PEK with China Southern Airlines. My flight is scheduled to arrive at 06:15 on Wednesday the 9th. I would then like to take an 11:40 am flight from Beijing (PEK) to Nanjing (NKG) with Shenzhen Airlines. I am worried that I am not giving myself enough time to go through customs, pick up my luggage and check-in for my domestic flight. I would appreciate your input on the matter. Thank you in advance!