atom_id	atom_symbol	chemical_shift	multiplet	coupling_constant
14	H	NA	NA	NA
15	H	6.22	d	16.4
16	H	7.52	d	16.4
17	H	6.92	dd	8.1,1.5
18	H	6.77	d	8.1
19	H	NA	NA	NA
20	H	NA	NA	NA
21	H	7.03	d	1.5
