number atom shift 1 H 8.539 2 H 8.637 3 H 8.505 4 H 9.033 5 H 8.292 6 H 4.436 7 H 1.642 8 H 1.957 9 H 8.618 10 H 3.514 11 C 135.485 12 C 136.178 13 C 134.917 14 C 134.314 15 C 136.601 16 C 143.517 17 C 60.436 18 N 43.957 22 P 27.668