CC(C)c1cc(C(C)C)c(S(=O)(=O)N2c3ccccc3[C@@]3(Br)C[C@H]4C(=O)N[C@@H](Cc5ccccc5)C(=O)N4[C@@H]23)c(C(C)C)c1
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?