CCOC1=C2[C@@H](CN(S(=O)(=O)c3ccc(C)cc3)[C@H]2c2ccccc2Cl)C(C#N)(C#N)C(C#N)(C#N)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?