Congratulations! That's a very rare find.
They aren't all orbiting a common barycenter though, I've made that same mistake as well. Rather, 1 and 2 orbit a shared barycenter, 3 and 4 orbit a shared barycenter, 3+4 (the shared barycenter) and 5 orbits another shared barycenter, which orbits a shared barycenter with 1+2. So it's (1+2) + ((3+4) + 5).
Yeah, the system map's picture is easier to visualize than my explanation is
