atom_id atom_symbol chemical_shift multiplet coupling_constant 17 H 2.13 d 7.2 18 H 2.13 d 7.2 19 H 2.13 d 7.2 20 H 6.52 q 7.2 21 H 5.95 t 2.1 22 H 2.26 dt 14.1,2.1 23 H 2.06 ddd 14.1,3.6,2.1 24 H 3.53 dd 2.1,3.6 25 H 3.69 s NA 26 H 3.69 s NA 27 H 3.69 s NA 28 H 7.42 s NA