Cc1ccc([C@@H]2[C@@H]3C(=O)N(C)C(=O)[C@@H]3[C@]3(C)C(=O)N(Cc4ccc(-c5ccccc5)cc4)CC(=O)N23)o1
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?