CC(=O)OCC1OC(N2C(C)=C(C(C)=O)C(c3ccc(Cl)cc3)C(C#N)=C2S)C(OC(C)=O)C(OC(C)=O)C1OC(C)=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?