atom_id symbol chemical_shift mult coupling 15 H 3.92 s NA 16 H 3.92 s NA 17 H 3.92 s NA 18 H 6.58 dd 8.3,0.7 19 H 7.39 t 8.3 20 H 6.52 dd 8.3,0.7 21 H 2.68 dd 17.1,12.0 22 H 2.65 dd 17.1,3.7 23 H 4.57 m NA 24 H 1.5 d 6.3 25 H 1.5 d 6.3 26 H 1.5 d 6.3