Cc1ccc2c(c1)[C@H]1[C@H](CO2)[C@H](c2ccccc2)[C@]2(C)C(=O)Nc3ccccc3C(=O)N12
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?