COc1ccc(N2C(=O)N3[C@H](c4ccc(Br)cc4)[C@@H]4C(=O)N(C(C)(C)C)C(=O)[C@@H]4[C@]3(Cc3ccccc3)C2=O)cc1
Hydrogen bond acceptor is the chemical compound which contains the lone electron pairs that participate in the hydrogen bond formation. This compound should contain a more electronegative atom (more electronegative than hydrogen) with lone electron pairs. Then it can attract protons from a donor. Moreover, the electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?