CC(C)[C@@]1(NC(=O)[C@@H]2C[C@H]3c4cccc5[nH]cc(c45)C[C@@H]3N(C)C2)O[C@]2(O)[C@H]3CCCN3C(=O)[C@H](Cc3ccccc3)N2C1=O.CS(=O)(=O)O
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?