CC1(C)CC[C@]2(C(=O)O)CC[C@]3(CO)C(=CCC4[C@@]5(C)C[C@H](O)[C@H](O)[C@@](C)(C(=O)O)C5CC[C@]43C)[C@@H]2C1
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?