atom_id	symbol	chemical_shift	mult	coupling
20	H	6.91	s	NA
21	H	8.02	d	6.8
22	H	7.55	m	NA
23	H	7.56	m	NA
24	H	7.55	m	NA
25	H	8.02	d	6.8
26	H	6.5	d	2.0
27	H	10.9	 br s	NA
28	H	6.21	d	2.0
29	H	12.8	s	NA
