1 4 Nitrate Ion 2 1 N 1.871360 -0.000005 0.045551 1 2 3 4 3 2 O 2.005641 1.091881 -0.569969 2 1 4 3 O 2.005720 -1.091542 -0.570571 2 1 5 4 O 1.602718 -0.000354 1.277194 2 1 6