number atom shift 1 C 53.320 2 N 56.963 3 C 62.658 4 C 158.787 7 C 48.067 8 C 48.067 9 H 3.729 10 H 3.729 11 H 3.798 12 H 3.872 13 H 3.872 14 H 3.107 15 H 3.006 16 H 7.846 17 H 3.006 18 H 3.107 19 H 7.846