atom_id atom_symbol chemical_shift multiplet coupling_constant 17 H 2.00 d 7.2 18 H 2.00 d 7.2 19 H 2.00 d 7.2 20 H 6.95 q 7.2 21 H 5.94 t 1.8 22 H 2.20 dt 14.1,1.8 23 H 2.09 ddd 14.1,1.8,2.4 24 H 3.90 dd 1.8,2.4 25 H 3.66 s NA 26 H 3.66 s NA 27 H 3.66 s NA 28 H 7.44 s NA