number atom shift 1 C 94.494 2 C 148.450 3 C 69.663 4 C 168.737 5 C 161.531 6 C 88.564 7 C 78.005 8 C 82.084 9 C 104.483 10 N 91.575 11 N 237.164 12 N 167.700 18 H 6.583 19 H 9.021 20 H 4.778 21 H 4.728 22 H 5.434 23 H 4.242 24 H 4.821 25 H 6.183 26 H 5.155 27 H 4.607 28 H 0.126 29 H 0.531 30 H 4.609