number atom shift 1 P -3.411 2 P -1.283 3 P 5.551 18 N 162.763 19 N 128.595 20 N 307.595 21 N 295.792 22 C 69.054 23 C 93.934 24 C 85.076 25 C 79.778 26 C 74.352 27 C 134.377 28 C 162.329 29 C 127.420 30 C 138.719 31 C 127.143 32 H 7.897 33 H 7.915 34 H 4.927 35 H 6.520 36 H 1.278 37 H 0.892 38 H 9.798 39 H 5.490 40 H 5.072 41 H 7.357 42 H 5.428 43 H 4.469 44 H 4.934 45 H 9.450 46 H 8.290