Carbon No. CHn Chem. Shifts Conf. Limits Av.Exp 1 CH 73.18 2.28 69.59..75.56 2 CH 71.70 1.87 71.00..72.40 3 CH2 36.72 7.05 24.16..37.47 4 C 75.40 2.28 76.50 5 CH2 40.41 1.53 37.55..40.95 6 CH 68.46 3.08 66.43..72.47 9 C 166.67 2.19 164.84..171.66 12 C 178.29 0.88 178.50 15 CH 119.60 1.93 115.00..115.60 16 CH 149.71 0.60 145.78..145.82 17 C 125.24 2.25 126.50 18 CH 113.60 1.70 113.58..113.62 19 C 143.70 1.81 143.68..143.72 20 C 146.70 0.60 146.68..146.72 21 CH 115.90 0.79 115.89..115.91 22 CH 122.40 0.41 122.38..122.42