CC[C@H](C)C1=C(O)[N@+]2([O-])Oc3ccc(-c4c(O)c(O)c(-c5ccc(O)cc5)c(OC(C)=O)c4OC(C)=O)cc3O[C@]2([C@@H](C)CC)C(=O)N1O
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?