C[C@H](O/N=C1\[C@@H]2CCn3c(=O)n(-c4ccccc4)c(=O)n3[C@H]2[C@H](O)[C@H]2O[C@H]12)c1cn([C@H](CO)Cc2ccccc2)nn1
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?