number atom shift 1 C 32.087 2 C 31.829 3 C 29.325 4 C 146.454 5 C 114.522 6 C 152.961 7 C 163.782 8 C 157.211 9 N 259.571 10 N 161.445 11 N 122.914 12 N 161.025 15 H 4.649 16 H 4.649 17 H 6.742 18 H 4.311 19 H 4.311 20 H 5.559 21 H 4.010 22 H 4.010 23 H 5.760 24 H 8.399