number atom shift 1 C 123.837 2 C 132.887 3 C 129.250 4 C 119.498 5 C 142.333 6 C 119.618 7 C 118.514 8 C 159.787 9 C 158.864 12 H 8.484 13 H 8.784 14 H 8.561 15 H 8.694 16 H 8.714 17 H 7.653