 11

C      1.044681   0.700550   0.076301
C     -0.333345   1.075482  -0.166249
C     -0.336764  -1.074993  -0.165145
C      1.042736  -0.702894   0.074768
H      1.913695   1.388882   0.091020
H     -0.644111   1.973843  -0.756314
H     -0.650609  -1.974380  -0.751861
H      1.910094  -1.393319   0.086971
C     -1.310044   0.001800   0.209373
H     -2.281048   0.002637  -0.333471
H     -1.526204   0.002990   1.317510
