CCN1C(=O)[C@H]2[C@@H](C1=O)[C@@H](c1ccc(C)cc1)N1C(=O)N(c3cccc(Cl)c3)C(=O)[C@@]21CC(C)C
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?