CC(=O)OCC(OC(C)=O)C(OC(C)=O)C(OC(C)=O)C(/C=N/N(C(C)=O)S(=O)(=O)c1ccc(/C=C2\NC(=O)N(C)C2=O)cc1)OC(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?