CC(=O)OC[C@H]1O[C@@H](O/N=C(\C)CCN2CCc3nc(-c4ccccc4)c(-c4ccccc4)cc3C2)[C@H](OC(C)=O)[C@@H](OC(C)=O)[C@H]1OC(C)=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?