number atom shift 1 C 154.372 2 N 71.482 3 N 203.548 4 C 176.480 5 C 53.186 7 N 79.775 9 C 37.755 10 H 6.871 11 H 4.734 12 H 4.499 13 H 2.786 14 H 3.690 15 H 6.481 16 H 4.331 17 H 4.898 18 H 3.026