O=C(OC(c1ccccc1)c1ccccc1)[C@@H]1[C@@H]2C(=O)N(c3cccc(F)c3)C(=O)[C@@H]2[C@H]2C=Cc3ccccc3N12
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?