C=C1C(=O)O[C@H]2C[C@]3(C)C([C@@H](OC(=O)/C(C)=C/C)[C@H]12)[C@](C)(O)CC[C@H]3O
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?