C=C1C(=O)O[C@@H]2[C@H]1C[C@@H](O)[C@H](C)[C@@](O)(C(=O)/C=C/C)[C@H]2OC(=O)C(C)CC
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?