C[C@@]12CC[C@H]3[C@@H](CC[C@]4(O)C[C@H](O)CC[C@@]34C=O)[C@]1(O)CC[C@@H]2C1=CC(=O)OC1
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?