COC(=O)CN1C(=O)[C@H]2[C@@H](C)C3=C4[C@@H](CC(C(=O)OC)=C[C@@H](C(=O)OC)[C@H]4[C@@](C)(NC(=O)c4ccccc4)C3=O)[C@H]2C1=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?