CC(=O)OC1CC(OC(C)=O)[C@]2(C)C(CC(OC(C)=O)[C@]3(C)C2CC[C@@]2(C)C(c4ccoc4)C[C@H]4O[C@@]423)C1(C)C
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?