number atom shift 6 C 70.283 7 C 71.689 8 C 73.639 9 C 68.935 10 C 63.705 11 H 3.186 12 H 3.280 13 H 3.219 14 H 0.497 15 H 0.013 16 H 3.844 17 H 4.695 18 H 4.614 19 H 4.275 20 H 4.866 21 H 4.652 22 H 4.134