O=C1[C@H]2[C@H]3C[C@@H]([C@H]2C(=O)N1c1ccc2c(c1)OCO2)[C@@H]1C(c2ccc(OCc4ccccc4)cc2)=NO[C@H]31
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?