C=C1[C@@H]2C[C@]3(C(CC2=O)[C@]24C5C[C@H]3[C@H]2N(CC)C[C@]5(C)CC[C@@H]4O)[C@@H]1O
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?