C=C1C(=O)[C@]23C[C@H]1CCC2[C@@]1(C)C(C[C@@H]3O)[C@](C)(C(=O)OC)CC[C@@H]1OC(C)=O
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?