18 O 0.15442 -0.24989 1.12504 C 0.20536 -1.61653 0.70699 C 0.72088 -2.42500 1.89160 C -1.17792 -2.10927 0.29470 C 0.10082 0.67764 0.04339 C 0.11181 2.08014 0.61980 H 0.91094 -1.72761 -0.12453 H 0.06367 -2.31272 2.76187 H 1.71005 -2.06545 2.19707 H 0.79909 -3.48896 1.64587 H -1.91571 -1.90793 1.07980 H -1.17033 -3.18391 0.08543 H -1.52786 -1.59600 -0.60649 H -0.81351 0.53035 -0.53935 H 0.97030 0.53834 -0.60844 H -0.74121 2.22745 1.29005 H 0.06943 2.82876 -0.17575 H 1.01635 2.24567 1.21368