CC(=O)n1cc([C@H]2C=C(C(=O)N3CCN(Cc4ccccc4)CC3)O[C@@H](OCc3ccc(CO)cc3)C2)c2ccccc21
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?