COc1ccc([C@]23CCC4(OCC(C)(C)CO4)[C@H]4CON(O[C@H](O[C@@H]5CCCCC5C(C)(C)c5ccccc5)C2)[C@@H]43)cc1OC
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?