COC(=O)C1=CO[C@@H](OC2OC(CO)C(O)C(O)C2O)[C@@H]2[C@H](C)[C@@H](O)[C@@H](O)[C@]12O
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?