Assuming the internal server ip address is 200.1.1.1:
object network obj-200.1.1.1
host 200.1.1.1
nat (inside,outside) static 200.1.1.1
OR/ if you are NAT exempting the whole subnet of 200.1.1.0/24:
object network obj-200.1.1.0
subnet 200.1.1.0 255.255.255.0
nat (inside,outside) source static obj-200.1.1.0 obj-200.1.1.0