number atom shift 1 P -2.621 2 P 1.367 3 P 6.052 19 N 157.580 20 N 166.106 21 C 74.600 22 C 110.369 23 C 89.877 24 C 77.957 25 C 77.892 26 C 157.080 27 C 166.995 28 C 151.807 29 C 108.749 30 H 7.737 31 H 7.355 32 H 4.736 33 H 6.845 34 H 3.590 35 H 0.990 36 H 7.235 37 H 5.745 38 H 5.751 39 H 6.061 40 H 5.421 41 H 4.920 42 H 5.778 43 H 8.368 44 H 6.822