number atom shift 1 N 38.092 2 C 43.940 3 C 28.468 4 C 28.647 5 C 46.797 6 N 204.081 7 C 146.847 8 N 74.243 9 N 68.636 10 H 0.836 11 H 0.281 12 H 3.620 13 H 3.697 14 H 2.615 15 H 2.082 16 H 2.816 17 H 2.499 18 H 3.932 19 H 3.749 20 H 3.313 21 H 3.143 22 H 3.446 23 H 3.867