C[C@]12c3[nH]c4cc(-c5ccco5)ccc4c3CCN1C(=O)[C@@H](CC(=O)NCCC1=CCCCC1)C[C@@H]2C(=O)N1CCCCC1
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?