4
H2O2 (hydrogen peroxide) has C2 symmetry
 1  -0.308452298   1.452830488  -1.932008292
 8  -0.308452298   1.452830488  -0.974008287
 8   1.094072021   1.452830488  -0.598203020
 1   1.453322043   2.254213106  -0.980942265
