C=C1C(O)C23CCC4C(C(=O)O)(C(=O)O)CC(OC5OC(CO)C(O)C(OC(=O)CCc6ccccc6)C5NC(=O)CC(C)C)CC4(C)C2CCC1(O)C3
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?