PM7 Mercury dibromide <Hg-Br> GR=AS1950 Br 0.00000000 +0 0.0000000 +0 0.0000000 +0 0 0 0 Hg 2.44000000 +1 0.0000000 +0 0.0000000 +0 1 0 0 Br 2.37169815 +1 179.9997748 +1 180.0000000 +0 2 1 0