number atom shift 1 N 40.929 2 C 58.548 3 C 179.575 5 C 27.517 6 C 33.534 7 C 170.537 9 N 108.164 11 H 2.098 12 H 0.933 13 H 4.266 14 H 3.207 15 H 2.973 16 H 3.030 17 H 3.398 18 H 4.825 19 H 5.473 20 H 6.401