number atom shift 1 P 1.487 8 N 85.074 9 N 175.429 10 N 264.022 11 N 258.362 12 N 244.510 13 C 69.277 14 C 95.864 15 C 96.027 16 C 79.775 17 C 37.329 18 C 160.699 19 C 156.330 20 C 127.199 21 C 147.796 22 C 160.948 23 H 3.659 24 H 3.782 25 H 0.427 26 H 5.425 27 H 6.202 28 H 4.867 29 H 6.545 30 H 7.396 31 H 5.155 32 H 5.160 33 H 3.292 34 H 5.140 35 H 8.690 36 H 10.069