20 O 2.85460 0.14126 -1.09174 C 2.35106 0.11231 0.02653 C 3.12913 0.08774 1.31721 C 4.63308 0.03227 1.07619 C 5.40061 -0.01323 2.37380 C 5.83800 1.17020 2.98329 C 6.54077 1.12656 4.18849 C 6.80751 -0.09808 4.79764 C 6.36979 -1.28036 4.20370 C 5.66742 -1.23905 2.99820 H 1.25357 0.11094 0.14431 H 2.79339 -0.78587 1.88740 H 2.85640 0.98391 1.88598 H 4.95737 0.90049 0.48797 H 4.89114 -0.84578 0.46993 H 5.63994 2.13372 2.51912 H 6.88341 2.04874 4.65057 H 7.35865 -0.13136 5.73366 H 6.57876 -2.23591 4.67782 H 5.33516 -2.17066 2.54561